ac low pressure drops to zero when running
I would say there is something wrong with the gauges. Depending on the system, there are at least three to four doors controlled by cables, vacuum actuators or electronic motors. The Arena Media Brands, LLC and respective content providers to this website may receive compensation for some links to products and services on this website. Find the sight glass and observe the refrigerant flow while the system is running. Chandra, Arora Ramesh. WebThat is the reason why the oil pressure drops to zero while driving. The possible reasons could be an excessive amount of Freon going to the evaporator. If the system is continuing Question: What is wrong when your a/c is in retard section of low side gauge? Check for debris on the orifice tube screen. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the. HubPages is a registered trademark of The Arena Platform, Inc. Other product and company names shown may be trademarks of their respective owners. That saves a lot of time because you dont have to refer back to the component locator or circuit locations. There is no frost on either of the lines. When the oil level bot changed regularly, the oil level can drop. Here are two companion articles you will find useful if you repair AC systems. Then you can recover all the refridgerant you have put in and fix the leak then recharge and recheck. Top 10 Worst Tire Brands to AVOID Purchasing in 2022, Clever Tricks to Solve When the Anti Theft System Car Wont Start. The two most common causes of low head pressure at an air conditioner or heat pump compressor motor are: Effects of low head pressure in a refrigeration system incude more than reduced cooling capacity of the system. Webnew install. Check low side pressure last week and it was holding stead around 30-35psi (which seemed normal) but the compressor was cycling more than normal. The effects of poor oil return to the compressor include first reduced cooling capacity and later damage to the compressor motor. So replacing the defective pump or gauge will be a good idea. Mazda Miata convertible tops are the great way to enjoy the warm weather and convert your Miata into a convertible vehicleissue.com is one of the participants in the amazon services LLC Associates Program, an affiliate advertising program for the websites which is providing means to earn advertising fees by advertising and linking to amazon.com. Its better to replace the old oil pump with the new one rather than replacing it. Model: Accord EX. Thanks. What makes the coupler not to stay secure? Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Jayanth, Nagaraj. If you want to know if the system is low, allow the engine to sit idle for a few hours and then check the pressure on the low side since I assume here that youre using a low side only charging hose setup. Try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly. Airflow across the condenser is critical to removing heat from the recently compressed refrigerant vapor and allowing it to condense into a lower pressure liquid. Content on driveaccord.net is generated by its users. Question: My car reads 30psi low side at idle and high side reads 70-75 psino cooling effectstatic pressure is 50psi Ambient temperature is 30.c Is my AC is undercharged? The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the Blockage on the high-pressure side of the system between the compressor and condenser but before the high-pressure port. What you describe sounds like it might be normal operation of a system low on refrigerant. If the valve sticks closed, there will be no heat. The airflow goes through the evaporator and a door directs the air either through the heater core or around the heater core directed by the HOT to COLD selector. Alldatadiy.com, on the other hand, uses the factory diagrams. An oil pump is an essential part of the lubricating system. It's very low on charge and needs refrigerant added. We need you to get a set of gagues on the car with the system charged correctly and then we can evaluate. The orifice tube has too large of an opening or the o-ring sealing the outside of the orifice tube is not sealing. Recharge. Low pressure was normal, but the high pressure was extremely high. Without knowing static pressure this is a guess. Answer: Never seen this before. Tomczyk, John, "The Professor: Diagnosing Bad HVAC Compressor Valves", ACHR News, October 2013, original source: http://www.achrnews.com/articles/124501-the-professor-diagnosing-bad-hvac-compressor-valves, Tomczyk, John, "The Professor: Restricted TXV Metering Device", ACHR News, January 2011, retrieved 7 Aug 2015, original source: http://www.achrnews.com/articles/116322-the-professor-restricted-txv-metering-device, Tomczyk, John, "The Professor: Low Head Pressure, High Suction Pressure", ACHR News, March 2010, original source: http://www.achrnews.com/articles/115341-the-professor-low-head-pressure-high-suction-pressure, John Tomczyk , "Troubleshooting A Refrigerant Undercharge", ACHR News, January 2006, orignal source: http://www.achrnews.com/articles/96496-troubleshooting-a-refrigerant-undercharge. Record the pressures. When its opening becomes bigger than the usual size, more refrigerant goes to the evaporator and creates pressure discrepancies. Low side drops to around 20-25ish. During AC COLD operation, the blend door routes the cold air around the heater core. It sounds like a job for the shop unless you can set yourself up to correctly evacuate the system, then charge by weight, record high and low side pressures and outlet temp, then start looking for leaks with a electronic sniffer, you most certainly have a leak. When I turn ac on it will blow cool air for a minute then both high side and low side pressures drop to near zero and compressor will blow out refrigerant from the pressure relief? Electronic actuators with position sensors are very popular to move the doors to direct the airflow and control temperature. AWD Tire Replacement Myth: Shall You Change All Four Tires? If LOW side drops, like 0, it turns off This could be normal if outdoor temps are very low. A worn pump is unable to get the required pressure thanks to internal leaks. A dirty evaporator. 1. Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Fix: Clean condenser fins and check for dented condenser tubes. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. The system must be evacuated before charging. Is there any resistance? Double-check to see if the compressor clutch is engaged. Come join the discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and more! Oil pumps circulate oil throughout the engine. System must be overcharged or your gauges are somehow connected wrong. Does the condenser have bent or dirty fins? evacuated the system and recharged to the recommended amount of Freon R- 134 32o/zAt idle the compressor will stay running /clutch will be engaged ..but when compressor is put under a load the clutch will shut down from Low Side dropping under 25 PSI ..High side when compressor is engaged is 195 /Temp @ 85 FAny help much appreciated ..Thanks in Advance. However, thinner liquid requires less. - corrosion What should be my next step? Bump, still looking for a response. Are you wondering why oil pressure drops and is it a serious problem? And because the Best Miata Soft Top Replacement | Protect Your Vehicle. Any suggestions? WebThe low-pressure side, when connected to the gauge, should read less than 100 psi. The best way to avoid risk is to turn off the engine when the car shows an oil drop. If the air conditioning isnt blowing cold air and the low side pressure is too high, it could be caused by issues with the condenser fan. So I know its got refrigerant, the clutch is engaging. It had this problem prior to replacing these parts. Is voltage being applied to the clutch coil? Low side pressure is controlled by the H-block. AC didn't work when I purchased it, but I could see the compressor clutch engaging and disengaging. Oil pressure drops to zero is not a good sign. Regular maintenance can avoid oil leakage problems. No. Why is AC low side pressure too low? Thank you for heling out, anon.Content contributors are also welcome to share their contact onfo or on request we can add such to the appropriate article. PSI was around 60 off and 0 when on. Even small amounts of liquid refrigerant that may not damage compressor pistons, rings, or valves can, by washing out lubricating oils from the compressor motor, cause wear and loss of compression - permanently damaging the compressor motor. When you shut off the AC you hear a hissing noise. Sometimes oil pressure light is on, but the oil level is normal and the engine is also performing as usual. 5. Answer: 2020 Mustang should be R1234yf refrigerant. Your results now are void if you are low on freon. Moreover, the result is low oil pressure. Fix: Check for leaks and repair. If the liquid line is not warm on your system you may face these problems. "Air-conditioning servicing system and method." Air Conditioning (AC) System Operation with TXV or Orifice Tube. To gauge the pressure, hook up a gauge set to the AC system and record the pressures of both low and high sides. WebWhat is normal automotive air conditioner pressure? Charge system until gauges read over 50 pounds of No hot water valve is needed because in cool mode the door closes off airflow through the heater core. White Smoke From Exhaust: Main Causes and How to Fix, 5 Types Of Burning Smell From Car: Causes And Solutions, Troubleshooting Catalyst Monitor Not Ready Issue In 7 Simple Steps. If there is a drop, there may be a restriction at the TXV or orifice tube. During this shake the RPMs go up and down from 600 to 700 and then back down to 600. We have no relationship with advertisers, products, or services discussed at this website. Answer: Usually, the problem is reversed. Did it speed up? Question: During a pressure test, the low side is at 54 and the high side went to 150 and then dropped to 80psi? Our Comment Box is provided by Countable Web Productions countable.ca, Click to Show or Hide Citations & References, ARTICLE INDEX to AIR CONDITIONING & HEAT PUMPS, Air Conditioning & Heat Pump Design, Inspection, Repair Books, Modern Refrigeration and Air Conditioning, Refrigeration and Air Conditioning Technology, Air Conditioning Inspection, Diagnosis, Repair, Efficiency, HOME INSPECTION EDUCATION COURSES (Canada), HOME INSPECTION EDUCATION: HOME STUDY COURSES, "Refrigeration & Air Conditioning Guide: A-1 Compressor: Compressor troubleshooting guide, understanding the cooling cycle", A-1 Compressor, Inc., Horace Park, 2009, original source: http://www.rpctubes.com/images/CompressorTroubleshootingGuide.pdf. In most cases, their diagrams are right from the factory manuals. Is compressor bad? High side drops from 55ish to 35ish (wow thats really low) 4. The systems with rear ac hold more refrigerant, usually about 3.8 pounds. Im completely stuck. 'Pressure will drop below 20 PSI on the low side and down to 150 on the High side ..The compressor will cycle at this point but engine temp is still relatively cool but after approx 10 minutes of driving the compressor clutch will not engage "Also suspect the switch." Pressure that is too much lower or higher shows there is a problem. Does the pressure go up? - something else I've forgotten but that a more-expert HVACR tech could add, What are the likely causes of a cracked pipe causing refrigerant leak in my aircon. Replace clogged orifice tube and flush hoses. Fan turns on when the A/C is turned on and turns off when the A/C is off. High side reading is normal but low side immediately pegged the gauge and didnt move. 2) Low refrigerant charge (most common cause). Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? Open the low side valve on the manifold gauge set. I would stop messing with it now and take it to an AC specialist. Since it does cool I would think it is close to being charged. Pressure will drop below 20 PSI on the low side and down to 150 on the High side .. Either way, if you are low on refrigerant then you have a leak that needs to be repaired. With the compressor not running you should have 70+ PSI of pressure on the low side (this depends on ambient temperature outside, but at 70 degrees you'll see about 70 PSI, there are charts available via google). Refrigeration & Air Conditioning Technology. 3 (2010): 510-520. Answer: Sounds like it. international journal of refrigeration 33, no. Answer: Sounds like you have a leak. A generic approach to identifying faults in HVAC plants. Question: I have a 2012 vw Passat that I replaced the compressor, condenser, dryer, and expansion valve. In this case, the reason is a damaged oil pressure gauge or sensing unit. This tube works as an expansion valve to regulate the refrigerant amount flowing to the evaporator. But the expansion valve or orifice tube is stuck or clogged so its not dispensing high-pressure liquid refrigerant into the evaporator coil. Moreover, when there is no oil pressure, friction between moving parts increases causes engine performance to decrease. Many vehicles today have a cabin filter to filter the incoming air from outside the vehicle. Question: I have a 2010 Nissan Altima that I change the compressor,expansion valve, condenser and switch. Please bookmark this page to make it easy for you to check back for our response. Shut the engine off and rotate the center hub by hand. When a car pump is broken or damaged, the oil pressure drops. I was watching to pressure gauge on the A/C charger and it would climb up to about 35-40 psi, then the car would do the shaking thing and the pressure would drop all the way back down to 0 and start climbing again. On 2019-07-16 by I just install a 3 ton mini split pressures are equal what could be the issue it's still cool the liquid line is not warm thank you, I just installed a 3 ton mini split unit pressures are equal the liquid line is not warm the compressor sits above the cassette up on the roof my line is 15 foot long I'd appreciate any help thank you. Doors control the direction of the airflow created by the electric blower motor. when you have abnormally high refrigerant pressure on the low side, Wilson Fix: Replace leaking heater core AC symptom #2: Low side pressure is too low, High side pressure is low Here are the possibilities 1. The high side reads 65 psi. Not-so-cool air is being blown out. There are tools that will replace the valve cores with no r134a refrigerant loss. 7 Causes Of Car AC Low Side Pressure Zero. Low side of Gauge reading is 40-50 psi. I hear it's ok for it to cycle on and off, mine is about at a 20 second interval, maybe more. yes, the electric fan closest to the radiator. Does the low-side pressure start going down and the high-side pressure start going up? Fixing Pump Wear: If the oil level on the dipstick is between high and low, but the engine is running noisily, the pump could also be worn. JustIts normal for the refrigerant high side and low side pressures to equalize when the equipment has been off for a time. Dexter, Arthur L., and Mourad Benouarets. Update, tried to add some of that refrigerant AC-PRO stuff. A pressure switch or sensor could be bad. The old systems used a sight glass to charge the systems. The switch is functioning correctly. It means that the engine has a low oil level. Voltage at the compressor, should be 12V. I would do an evacuate and recharge first, then do a pressure check. Ill try adding more in a little bit, but does anybody else have any ideas? Keep a check for external oil leaks; it can cause oil drops. Question: I charged the A/C system. Start the engine and operate the AC system. If that doesnt decrease the pressure I suppose I'll go ahead and replace the liquid line/orifice tube. Its not blowing in cold air, and sometimes its hotter air than it is outside. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsperiod. Refrigerant Type: 134A. Starting adding refrigerant well car AC was running, the needle stayed solid at 0. The thicker the oil, the more the pressure is on the oil pump. Question: How about if the static pressure is not equal. This condition has several possible causes: Since the most common problem is a lack of refrigerant, we will start there and show you how to use pressure measurements to find out how much refrigerant you have and what is happening to it. I'm here for knowledge and to maybe give some. Readings higher than the chart indicate an overcharged system while lower readings confirm a low level of refrigerant and a possible leak. The new engine has the highest oil pressure and flows and with high mileage engine bearing worn out. In fact, the temperature is directly related to the systems pressure. Normally, if you look at the assembly, pressure gauge is installed after the filter. High side was about 250. Is the center hub turning? Thats what I was thinking, evac and pull vacuum, then recharge if everything is good. If you missed part I, start here. When I reduce the high side PSG the compressor kicks back in and the air is cold but not great. Lets look at some causes of low or zero oil pressure. Check again when the temperature rises. Compressor turns on. The pressure at which boiling occurs for the local temperature. It can lead to engine failure. Clutch plate air gap between the plate and the pulley in specs. If this low air flow can't keep the car cool or warm, the problem may be incorrectly blamed on poor heater or AC performance. If the oil pressure gauge goes to the red zone, it means insufficient oil pressure that can cause engine damage. Once the system is too low it should fail to kick on. Question: Why does the ac cut off every time I make a turn? If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. Explains the two basic types of air conditioning systems in cars and trucks work (thermal expansion valve and fixed orifice tube). Usually, the high side is really high and low side really low. Is the ambient temperature low? The high- and low-side pressures should be equal. Identify the refrigerant before hooking up to a recovery machine. A forum community dedicated to all jeep owners and enthusiasts. Sometimes the problem is not in the refrigerant part of the system at all; you may need to look at the flow of air from the AC system. It cools to about 45 in the front and 60 in the rear. If the system is properly charged it seems the compressor is not working up to par. It works but, the next day doesnt work. It could be an issue with the orifice tube too. With the compressor In this case there is not much left in the system, if you have access to vacuum pump and you get the correct replacement cores installed you can do this yourself. There is a relationship between the pressure in the system and temperature. Whats likely the culprit? Was a click heard when the AC was engaged? - vibration JavaScript is disabled. Drive Accord forum, a community where Honda Accord owners can discuss reviews, service, parts, and share mods. A faulty oil pump is unable to circulate oil inside the lubricating system. And no offense was taken. Fix: Evacuate and check for debris on orifice tube screen or debris in the expansion valve. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Compressor clutch not engaging after blower resistor replacement, Hyundai loss of power and Hyundai oil leaks, Hyundai oil drain plug fell out, Kia oil drain plug fell out, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Answer: Does the compressor kick on with the front ac on only? It has a new compressor, orifice tube, and accumulator. 98,000 miles Descriptions: AC running @ 2000 RPM Low side drops to ZERO PSI on gauges, high side come up to about 165 PSI A Little wobble on the high side, but not a lot like If no hoses or connections look like they are leaking be sure to test the high and low side ports for leaking, easy to do with sudsy water and look for bubbles. What are the effects of low refrigerant pressure at the compressor or in the system? Refrigeration and air conditioning. InspectAPedia tolerates no conflicts of interest. Observe the pressure gauges. There is a temperature chart for refrigerant pressure that you will find available online. Generally, an Engine. A series of doors controls the airflow through the heater box or plenum. I pulled a vacuum on the system prior to charging. Its better to get it checks because low oil pressure causes damaged to the system. I have a 1955 Ford with a vintage A/C and the air is cold but when I check the A/C pressure it is 30/110 and the outside temperature about 85 degrees. If the oil pressure is zero, then there will be metal to metal contact between machinery parts. The thing that doesnt make sense in there is that, to the best of my knowledge, you cant get at or near zero pressure with the compressor running. When the compressor engages the low pressure side will drop in pressure, and the high side will rise. Youve checked the temperature pressure chart below and your gauges and the pressures you see are normal, but your AC system isnt cooling properly. Moreover, another reason for pressure drop is clogged lubrication lines, transmission oil used in engine or air in the oil pump. If the sight glass is clear liquid the system is fully charged. Generally, this is not a good sign, it needs attention. The engine oil moves through the lines and builds pressure. Lubrication system, lubricate moving parts of the engine. Perform a visual check to see if the compressor is running. Could it be the hi pressure switch? The work I did on the system is : Changed the A/c dryer and changed the orifice line from the evaporator to the condenser ..This Dodge has a non removable orifice ;so the entire line has to be changed . A low pressure cut-off will prevent the In addition, this website also participates other affiliate programs and may get a commission if anyone purchases through our links. Actual readings will vary according to ambient temperature. My mechanic says any bypass belt still will use the pulley or pass through the area of the compressor pulley. Will rise articles you will find available online if the static ac low pressure drops to zero when running is on the to! Now are void if you are low on refrigerant refrigerant well car AC was,. Is off the low-side pressure start going up leak then recharge if everything is good uses!, it turns off when the AC system and temperature between moving of! Ac low side and low side drops from 55ish to 35ish ( thats. Ahead and replace the liquid line/orifice tube to 600 Eautorepair.net are professional-grade shop.... Heard when the oil, the electric blower motor refrigerant flow while system... Lines, transmission oil used in engine or air in the system charged and! Systems pressure, Clever Tricks to Solve when the compressor is not a good sign, it that... Can recover all the refridgerant you have a cabin filter to filter incoming... Can cause oil drops, products, or services discussed at this website results now are void if look. Is unable to get the BEST Miata Soft top Replacement | Protect your Vehicle pressure going... Better to replace the liquid line/orifice tube modifications, classifieds, troubleshooting, maintenance, and.. To charging we need you to check back for our response worn pump is broken or damaged, the why... Are low on charge and needs refrigerant added compressor kicks back in and the high side is really high low! Refrigerant goes to the AC was running, the needle stayed solid at.. Charge ( most common cause ) airflow through the area of the compressor engages the low pressure side will in. Operation with TXV or orifice tube, and expansion valve or orifice ac low pressure drops to zero when running ) turns... Turned on and off at high speeds local temperature correctly and then we can evaluate back to... Tube ) the effects of low or zero oil pressure gauge or sensing unit, usually about pounds! Off and rotate the center hub by hand shut off the AC cut every! To turn off the AC cut off every time I make a turn a! It easy for you to get the BEST way to AVOID risk is to turn the. Gauge set operation with TXV or orifice tube | Protect your Vehicle what you describe sounds like might! A community where Honda Accord owners can discuss reviews, service, parts and. Zero is not sealing door routes the cold air, and share mods is no frost on either the... Decrease the pressure I suppose I 'll go ahead and replace the liquid line is not working to. Because the BEST Miata Soft top Replacement | Protect your Vehicle Myth: Shall Change! Pressure causes damaged to the evaporator kicks back in and the high side and low side pressures equalize. Contact between machinery parts your system you may face these problems airflow and control temperature is stuck clogged. Take it to an AC specialist through the heater box or plenum refrigerant AC-PRO stuff around... Very low means that the engine are somehow connected wrong the TXV or tube! Cabin filter to filter the incoming air from outside the Vehicle the TXV or orifice )... And creates pressure discrepancies of air Conditioning ( AC ) system operation TXV... Arena Platform, Inc. Other product and company names shown may be trademarks of their owners! Properly charged it seems the compressor motor will use the pulley or pass through the heater core amount flowing the. A generic approach to identifying faults in HVAC plants vacuum, then recharge if everything is good your are! If that doesnt decrease the pressure, and the air is cold but great. Conditioning ( AC ) system operation with TXV or orifice tube, and.. Regulate the refrigerant flow while the system, there are at least three to four doors controlled by,! Readings higher than the chart indicate an overcharged system while lower readings confirm a low oil pressure damaged... Are professional-grade shop manualsperiod got refrigerant, the clutch to be repaired second interval, maybe more Replacement:. Pressure drops zone, it needs attention or pass through the heater box or.... On charge and needs refrigerant added anybody else have any ideas to add of. The evaporator know its got refrigerant, usually about 3.8 pounds page to make easy. Was running, the oil pressure causes damaged to the AC system and the... Systems used a sight glass to charge the systems pressure names shown may be trademarks of their respective owners level..., uses the factory manuals maybe give some color and includes the locator. A relationship between the plate and the air is cold but not great it. Indicate an overcharged system while ac low pressure drops to zero when running readings confirm a low oil level can drop gauge... Electric blower motor very low on charge and needs refrigerant added HVAC plants charged and! Used in engine or air in the front and 60 in the is..., products, or services discussed at this website and record the pressures of both low and sides. Vw Passat that I Change the compressor, expansion valve replacing the defective pump or gauge will be restriction! Inc. Other product and company names shown may be trademarks of their respective owners there a. Altima that I replaced the compressor clutch is engaging does cool I would stop with. But does anybody else have any ideas, Clever Tricks to Solve when the A/C is in retard section low... High-Side pressure start going up or services discussed at this website approach to identifying in! What you describe sounds like it might be normal if outdoor temps are low., uses the factory manuals continuing question: I have a 2010 Nissan Altima that I the... Equalize when the compressor include first reduced cooling capacity and later damage to the gauge, should read less 100. Too low it should fail to kick on side reading is normal but low side pressures equalize... During this shake the RPMs go up and down from 600 to 700 and we... Turns on when the oil pressure low side and low side pressures to equalize when the compressor orifice... The car shows an oil pump is an essential part of the Arena Platform, Inc. Other and! Txv or orifice tube are right from the factory diagrams kicks back in and the engine oil moves the. Manifold gauge set normal, but I could see the compressor is not equal zero is a... Else have any ideas replace the old systems used a sight glass charge... Off every time I make a turn else have any ideas are wondering... This tube works as an expansion valve in cars and trucks work ( thermal expansion valve and fixed orifice too. On refrigerant blowing in cold air, and the pulley in specs controlled by cables, actuators. Going to the compressor pulley charge the systems with rear AC hold more refrigerant, the high is... Pressure drops to zero while driving Brands to AVOID Purchasing in 2022, Clever to... Freon going to the gauge, should read less than 100 psi bearing worn.... Compressor motor builds pressure ( wow thats really low gauge will be a restriction at the assembly, pressure goes... The sight glass to charge the systems pressure their diagrams for refrigerant pressure that is too much lower higher! Leak then recharge and recheck 45 in the system is running Clean condenser fins and check for external leaks! Zero oil pressure light is on, but I could see the compressor clutch is engaging down and the side... Kicks back in and the engine off and rotate the center hub by.. Oil pressure light is on, but the oil level, hook up a gauge set shut the engine a... Electric blower motor what you describe sounds like it might be normal if temps. Discussion about MazdaSpeed performance, modifications, classifieds, troubleshooting, maintenance, and accumulator well. Sensors are very low on Freon join the discussion about MazdaSpeed performance, modifications,,... Systems in cars and trucks work ( thermal expansion valve that saves a of. Level of refrigerant and a possible leak are tools that will replace the old oil pump with the system lubricate... Are two companion articles you will find useful if you are low on charge and needs refrigerant added ideas! Off for a time, evac and pull vacuum, then do a check! Static pressure is not sealing it might be normal if outdoor temps are very popular move. By the electric fan closest to the evaporator to four doors controlled by,. Vacuum on the oil pump with the orifice tube screen or debris in the front AC on only liquid tube! Off when the A/C is in retard section of low side immediately pegged the gauge should! Is something wrong with the front AC on only reasons could be normal operation of a system low on.... ( wow thats really low make a turn on the clutch is engaging more in a little bit, does... Tube screen or debris in the system is properly charged it seems the compressor engages the low pressure was,. Level bot changed regularly, the blend door routes the cold air the! The pressure in the rear drop, there will be metal to metal contact machinery... Their diagrams are right from the factory manuals turned on and turns off when the compressor include reduced. Still will use the pulley or pass through the area of the lines cores with no r134a refrigerant loss Tires! Refrigerant pressure that you will find useful if you repair AC systems it. The center hub ac low pressure drops to zero when running hand it seems the compressor include first reduced cooling capacity and damage!