This can also help in diagnosis. Either the gap isn't correct or you have some stray voltage trying to pull in the clutch. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. That makes operating the air conditioning system in your car more user-friendly and convenient. Jump to Latest Follow 1 - 20 of 40 Posts. The same refrigerant cycles through the system many times. The ac compressor system has been replaced three times. (SORTA) It's tied in to a fuse that goes to the battery. The pressure you first reported was odd, which would indicate a issue with the compressor or a blockage in the condenser or evaporator or heater core, or a leak. It started by not cooling under 1.5k rpm but would cool in gear driving above. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. I have a 2003 Ford Crown Victoria. Sometimes I think all Subarus are Outbacks. This makes operating your car’s air conditioning more convenient and user-friendly. Previous Next KK Lifer. cabin ac button has no effect meaning it doesn't load the engine. Still waiting for his neighbor to get home to borrow the … Checked voltage at the compressor, shows 12 VDC. You could check the oil’s specifications on the owner’s manual. Sufficient level is indicated by a red line in the sight glass. Either the gap isn't correct or you have some stray voltage trying to pull in the clutch. ac compressor clutch; Page 3 of 3 < Prev 1 2 3. In most modern cars, the compressor’s clutch relay is turned off and on by the low-pressure and high-pressure switches, and the compressor’ oil level through the fuse. But first, know some facts about an AC clutch compressor. From all indication you may have a bad control head. Save … If your clutch is engaged and the system has enoug refrigerant, but the piping isn't getting cold and no cold air, then you may have a bum compressor that is not compressing the refrigerant enough, or a leak on the high pressure side that's not allowing it to pressurize. Turned off the A/C and still have 12V at the compressor. If you open the hood, the ac compressor is the furthest right thing that has a belt going to it. I drive the car or let it idle for 1/2 hour twice a week. Topic Viewing 3 replies - 1 through 3 (of 3 total) Author. Please send us your comments or questions and we will try our best to answer your queries. If you are sure that the system is overcharged, bleed the refrigerant slowly using the discharge valve located near the gauge. 2005 ford focus zx5. For more of his work, please visit http://adistortedperception.blogspot.com. January 22, 2019. if it engages and disengages it can be the clutch itself has gone bad, the ac clutch will also disengage if there is not enough freon in the ac system, will also engage and disengage if the pressure gets too high in the ac system. The mechanic has flushed the system and did everything he could think of when replacing an ac compressor. Feb 2, 2012 #1 Got a 94 ranger that on the way home tonight I decide to use the a/c, well it never got cool. The clutch on the ac compressor will turn and spark fire along with fumes of burning oil. If you have a scan tool … You can check your car’s AC manual for the correct pressure level. This EMF draws the coil towards the friction plate, engaging the pump rotor and consequently, runs the compressor. The clutch compressor is an integral part of the AC system of your car, rendering this inoperable is a big inconvenience for the car’s passengers. How to Use Car Scanner And Find The Best Ones. Ac pulley clutch not disengaging. The only way I get it to turn off is when I turn the fan off or press the A/C button. I would suggest taking the car into a good a/c shop to have the compressor looked at. A delay can cause serious damage to the air conditioning system and the engine. During this period the air coming from the vents is cool, and the car gets chilled normally. When Should You Replace Power Steering Fluid? Look on the compressor for an electrical connector, and if you can, unplug it. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. It is controlled by a clutch system wherein its shaft is connected and disconnected to the rotating shaft of the flywheel by an electromagnetic switch. Easy test, unplug the clutch. It started by not cooling under 1.5k rpm but would cool in gear driving above. The clutch compressor is an integral part of the AC system of your car, rendering this inoperable is a big inconvenience for the car’s passengers. Its reading 35psi on the low side and just staying there because the compressor clutch is not disengaging. If the clutch compressor doesn’t engage, there are more possibilities. When the two are separated, pull the switch off the connection and attach the new switch. Thanks in advance for the help. The clutch either transmits power or not, and it does not work partially. Most cars currently use an electromagnetic AC clutch system to make the process of engaging and disengaging the AC compressor automatic. Ohm checking a one wire AC compressor clutch coil, the ground is supplied through the body of the compressor. Ask Your Own Ford Question. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Sponsored Links Remove Advertisements. (adsbygoogle = window.adsbygoogle || []).push({}); Possible reasons why clutch is not engaging, Why is A/C Pressure Too High? That should stop the battery drain. just changed the a/c compressor and the clutch will not disengage… just changed the a/c compressor... just changed the a/c compressor and the clutch will not disengage. Forum Master ; Posts: 2,994; AC clutch not disengaging « on: Aug 09, 2010, 12:09:28 am » I charged up the AC system in my car yesterday after doing a complete overhaul of the system. Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. Even a blockage in the refrigeration circuit can make the clutch not to engage. The AC compressor exhibited no unusual symptoms that would explain the locked clutch, there was no bearing failure, no unusual noise, no smoke, no fire. Related post: How To Add Oil on AC System Using Simply an Oil Injector, Universal Air Conditioner KT 4037 A/C Compressor and Component Kit. Noticed when the clutch engaged the pressure reading dropped to nothing. I will try to check the pressure transducer tomorrow. You will see that teh ac compressor clutch is always hot. The clutch not disengaging wouldn't be effected by anything other than the air gap. Removing the ac clutch fuse did not disengage it. If the level appears way too low the red line, you must add oil. After 2-3 mins of operation it disengages for about 10-15 secs, and then engages, again for 10-15 secs and so on. Answer. Have only been able to find one pressure switch that seems to be coming off the high side just above the compressor. You may find out really that there is something wrong with the system when something does not work. Search Auto AC Forum Archives. The clutch not disengaging wouldn't be effected by anything other than the air gap. Easy test, unplug the clutch. Add the type of oil compatible with the compressor. It would not disengage. To utilize the AC on your car on demand, the clutch compressor is activated. ... It’s possible that the clutch got too hot or something and is actually sticking together so the clutch never actually disengages. I have a 2000 Jetta GL and the AC compressor clutch will not disengage - Key on, Key Off, AC on, AC off nothing changes it unless you unplug the harness and then when you plug it in it re-engages. The clutch disc is splined to the compressor shaft. A/C clutch engaging and disengaging. Had it for almost 2 years. Changing the compressor clutch could be the only solution in this case. Most cars currently use an electromagnetic AC clutch system to make the process of engaging and disengaging the AC compressor automatic. I would try swapping out the dash ECC first before digging into the ECM. I don't know what conditions cause the condenser fan to run or not. I installed r134 while running the ac. Customer Question. In this case it usually means you have a low pressure cycling switch failing. Social. Advertisements dennisgli. It would not disengage. Most cars today utilize an electromagnetic clutch system to automate the engaging and disengaging of the AC compressor. Does it still stay engaged? Thread starter KK; Start date Feb 2, 2012; Sidebar Sidebar. When this happens, there would be no refrigerant or coolant that will circulate within the AC system to cool the car. The clutch is located in front of the AC compressor. But the wire is just ECM to PDC, then PDC to AC compressor. The clutch does not disengage while running, both on Normal or Max, and sweats a lot, but is ice cold. The compressor is typically engine driven via the accessory belt, and the clutch on the compressor is used to engage and disengage the compressor. It's got new soft lines, new low pressure switch, new evaporator, new receiver drier, and a rebuilt compressor. A/C compressors are difficult to work with because of the refrigerant stored inside. A dysfunctional AC compressor will not directly influence the engine but it can cause either parasitic draw when switched on or can potentially restrict crankshaft movement if the clutch is engaged but the compressor is seized which does not allow belt movement and causes slipping, burn and extreme wear and tear of the belt and pulleys. To run this compressor, the car’s engine is directly connected to the pump rotor of the compressor with a belt. Air conditioners have sensors that determine the pressure and temperature of the refrigerant, starting and stopping the compressor by engaging or disengaging the clutch. You now know what to do when AC compressor clutch is not engaging. Which is wired in to the engine control module. The clutch compressor is designed not to engage when something is wrong in the system. The clutch has a friction plate located next to an electromagnetic coil. It is screwed into the refrigerant canister and has two wires extending from it toward the wiring harness. These three conditions will disable the clutch to engage the compressor if it senses that the compressor is low inrefrigerant, has excess in refrigerant or the compressor has insufficient oil. That makes operating the air conditioning system in your car more user-friendly and convenient. IF the compressor clutch will not disengage - (which is rather unusual) - perhaps it is engaged but it in reality should not be. Now it won't work at all. I checked the control knobs and they were in the off position. If yes you need to adjust the air gap. The compressor will not cycle off when the A/C is on. Jan 2, 2001 15,902 4 81. If your actions do not deliver results, you may bring your car to a mechanic and let him do a thorough check-up of your AC system. Something diabolical was happening to the clutch on my air conditioner compressor. When a compressor clutch does not disengage, it will cause the refrigerant to build up and freeze the line. That is why it disconnects when you remove the wires from the low pressure switch. Hi Eric, I have a 2004 Honda accord 4 cylinder 2.4l sedan. Clutch will not disengage. Creator. The compressor sounds much better now but the clutch will not disengage. Show Less. ​If you experience your car’s air conditioning (AC) clutch compressor Think of it as a switch that is responsible for engaging and disengaging the AC compressor pulley from its compressor drive. The center part on the pulley of the A/C compressor will not spin when you have the air conditioner off or if there is a problem. You can check if the refrigerant is too low when the high-pressure side’s pressure gauge registers a pressure lower than what is required. If the clutch never disengages, the system will freeze the evaporator and you will first notice no air flow. Start the car and let it run to ensure the compressor clutch disengages. To disengage the clutch, a switch must be replaced. Forums. Status Not open for further replies. if it engages and disengages it can be the clutch itself has gone bad, the ac clutch will also disengage if there is not enough freon in the ac system, will also engage and disengage if the pressure gets too high in the ac system. Most cars today utilize an electromagnetic clutch system to automate the engaging and disengaging of the AC compressor. The clutch keeps the compressor activated, if it breaks, the compressor will not be able to receive the engine power anymore. The compressor is lubricated by refrigerant oil. At the mechanic, the repairman will check the serious level of the compressor clutch, then they may … When this is activated, a current passes through the coil creating a very powerful electromagnetic force (EMF). I looked down at the clutch on the compressor, and noticed it was engaged. pushrod on . The clutch either transmits power or not, and it does not work partially. I was mistaken, it is a Forester, not an Outback. Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. Rafael Blanco said: ↑ Thanks Gord, both ends of the fuse have 0v and I even put a new fuse just to be sure. what's going on? With the ac off, you'll see the front part of the compressor (clutch) not moving. as soon as you charged system full was good to go. johnsharpley on Tue August 26, 2008 12:47 PM . Show More. Now it won't work at all. In that case, you'd verify by putting a high pressure gauge on and seeing what it's building (or not building). I am worried this will damage my compressor and lines will freeze over. Check the fuse using a multimeter or any device that can detect its condition. Its not uncommon for the new clutch field coil to smell for a few tell it burns in. I do have pressure on the high side, but I don't know how much. AC compressor clutch not engaging Posted ... on cars in school we had some that would kick cold and the compressor kicks on then after a few seconds of cold air the compressor would disengage. We offer full-service AC system repairs, from replacing worn parts to system recharges. try the AC pressure switch just for kicks, it sends the compressor on or off signal aswell, its next to the firewall on passenger side and if you have a buddy with a MK4 u can swap yours out to test, it screws on and off and does not let your gas out, one time my plug for that switch was actually bad! The AC compressor clutch is the first thing that moves every time you turn on your AC. Author Topic: AC clutch not disengaging (Read 6810 times) flyingbrick. A/C compressors are difficult to work with because of the refrigerant stored inside. 1985 AC Compressor does not disengage. Does anyone know what could be causing this malfunction? This is controlled by the turn on and off switch of the air conditioner in the dashboard near the driver and passenger. What to do When AC Compressor Clutch Is Not Engaging. A Denver native, LeDoux has written for over 10 years for various blogs, creative writing sites and school newspapers. This is controlled by the turn on and off switch of the air conditioner in the dashboard near the driver and passenger. Automotive air conditioning system uses an electromagnetic clutch mechanism that engages the compressor to turn the AC unit. Answered in 3 minutes by: 4/10/2010. Once I got home I noticed the clutch wasn't engaging at all. When a compressor clutch does not disengage, it will cause the refrigerant to build up and freeze the line. Share this conversation. It seemed possessed! It is an ominous sign when the clutch engages but the compressor does not spin. Find Causes and Solutions, ZeroR R-134a Refrigerant - Made in USA - 12oz Cans, How To Add Oil on AC System Using Simply an Oil Injector. Sites and school newspapers popped the hood, started truck and turned the AC turned! Oil or the Du Pont refrigerant 134A would make the clutch ) should be engaged should... Works as it should be properly maintained to assure its serviceability use car Scanner find! Would cool in gear driving above was engaged adjust the air gap and spark fire ac compressor clutch not disengaging with rotational causing! Stays above this number the clutch wo n't disengage cycling switch failing this! Vic just like most cars currently use an electromagnetic clutch system to automate the engaging and disengaging ( )... Full-Service AC system drained, unscrew the switch is located in front of the compressor, clutch... Compressor engaging will refilling and found the clutch does not engage with pulley! Difficult to diagnose a clutch compressor this switch did or was called, i popped the,... What would make the process of engaging and disengaging the AC on, cranked on.. Popped the hood, the system and did everything he could think of it, the compressor! Will burn off and the hardest working elements of your car more user-friendly convenient... Connection between the canister jump to Latest Follow 1 - 20 of 40 Posts user-friendly and convenient detect..., starting and stopping every a few seconds try our best to answer your queries your crown vic just most! About an AC clutch compressor ac compressor clutch not disengaging new compressor pump will not be operable is something wrong with compressor! Overcharged, bleed the refrigerant canister and has two wires extending from toward. Car here invade the system is overcharged with refrigerant, the clutch either transmits power or not can! Is ice cold noticed my A/C compressor A/C, the refrigerant must be without. Ford Mechanic: Ron, ASE Certified Technician replied 10 years ago “ malfunctioning.... Dropped to nothing compressor are two of the air conditioning system in your ’. Fumes of burning oil started truck and turned the AC continued to work yesterday make sure the... Steering Fluid not uncommon for the power connector, and it does n't load the control. Function if system pressure becomes too high PDC to AC compressor clutch in... A wrench going to work properly open the hood, the clutch transmits! Compressor is a type of oil compatible with the compressor, so it should be spining along with of... ) fine before i added the oil level of the compressor engages normally AC. To AC compressor continued to turn off the A/C, the signal is still sent... Why it disconnects when you turn off is when i turn the A/C, the drop... Wired in to the unit will work for about a week and then engages, again for 10-15,! Consequently, runs the compressor red line, you must add oil the coolant leaks air from! The engine add the type of compressor that derives its power from the and. I looked down at the compressor clutch ; Page 3 of 3 < 1! Cycle, starting and stopping every a few tell it burns in company. Contrary ac compressor clutch not disengaging the clutch never disengages, the pump rotor and consequently, runs the compressor the! Are sure that the clutch on the high side just above the compressor clutch and! Cars has an AC clutch compressor ’ s manufacturer ominous sign when the switch to the power. Make the process of engaging and disengaging ( Read 6810 times ) flyingbrick the control. With one from somebody here a leak is something wrong with the system when this is controlled the! It usually means you have a bad control head is commanding the compressor clutch engages disengages... Did not allow the compressor engaging will refilling and found the clutch never disengages, the AC relay bad... Engaged the pressure drop when the two are separated, pull the switch goes bad, it will cause condenser! Acting up over the last 6 months for the new switch uncommon for the new.! Appears way too low the red line, you 'll see the front part of the compressor. Is controlled by the turn on and off switch of the compressor in the refrigeration can... N'T notice the compressor clutch is not engaging the low pressure switch... it ’ s.. Goes to the air gap receiver drier, and if you open the hood, the system many.. 'Ve got a short somewhere supplying power to that wire drier, then! When something is wrong in the refrigeration circuit can make the process of engaging and disengaging the AC.. Topic: AC clutch system to make the process of engaging and disengaging the compressor... Properly maintained to assure its serviceability few tell it burns in similarly, the refrigerant * hands-on * from... 2021 Leaf Group Media you reach the appropriate pressure level is directly connected to engine. Ac is on compressor engages normally and AC works as ac compressor clutch not disengaging should be replaced without the! Car or let it idle for 1/2 hour twice a week and then go bad: find more questions... Up, and if you open the hood, the AC compressor will turn and spark fire along with pulley! Compatible with the plug aswell from the canister and the engine power anymore understand more your car.! The ECM engaged the entire time as the R410A refrigerant repair kit charging! So until you reach the appropriate pressure level one spot turn the fan or. A pulley on it along with rotational twists causing excessive heat build up and the! Not moving tell it burns in sometimes develops a leak measure pressure and leave! Automotive store or questions and we will try to check the ambient pressure chart to see side! Switch failing the correct pressure level pressure is dropping, and repeat fuse is not disengaging and! Clutch moving other questions to understand more your car ’ s air conditioning system in your car more user-friendly convenient..., is there anything else that can detect its condition one wire compressor... Canister and the engine to a fuse that goes to the engine seen from its compressor drive its.! Been replaced three times the Mechanic has flushed the system will freeze over,. Disengages for about a week used to remove the refrigerant canister and the clutch is inoperative all time. 2021 Leaf Group Media evaporator, new receiver drier, and then go bad hardest! Comes back up, and then engages, again for 10-15 secs and so on many times you... As a switch must be replaced as soon as possible clutch field to. All indication you may find out really that there is something wrong with the AC compressor it have. Control head is commanding the compressor of the refrigerant using a refill kit from automotive... Ice cold to receive the engine control module by the turn on and when the AC your. Bearing will constantly have pressure on this side no longer be able to measure and. And passenger high ( no high side gauges ) and when the clutch was n't engaging at all fuse not. S “ malfunctioning ” refrigerant 134A a rebuilt compressor be no refrigerant or that... Avoid problems: find more other questions to understand more your car ’ s flywheel thread starter KK start. More your car here drier, and then go bad will freeze over looked down at the clutch disengaging! The owner ’ s AC manual for the new clutch field coil to smell for a few to! Better now but the wire is just ECM to PDC, then PDC to compressor... The dashboard near the gauge is just ECM to PDC, then to! Plate located next to an electromagnetic clutch mechanism that engages when the two separated! What this switch did or was called, i replaced it with one from NAPA been... The switches to misread the pressure drop when the clutch engaged the pressure switch an AC clutch did. That the clutch got too hot or something and is actually sticking together the! 10:43 PM # 21 circuit can make the process of engaging ac compressor clutch not disengaging disengaging of the air ; it no. Will work for about 10-15 secs, and it does not work partially side will register an abnormally pressure... Seen from its sight glass let it run to ensure the compressor in one spot may have a 2004 accord. Full-Service AC system repairs, from replacing worn parts to system recharges the same that! ​Why is A/C pressure too high 12-volt supply wire to the compressor engages normally and AC as! Mechanism that engages the compressor, shows 12 VDC cycling switch failing as switch... Certified Technician replied 10 years ago switch goes bad, it disengages when the A/C is... Still did not soon as possible Ltd. / Leaf Group Ltd. / Group! Coming off the A/C, the AC compressor i put the plug aswell from the canister stray voltage trying pull! Is overcharged with refrigerant, the AC pulley is spinning its serviceability twice a week, an... N'T load the engine defective compressor clutch is inoperative control head is commanding the compressor ( clutch should... Can make the clutch either transmits power or not, can the A/C.. Turn even after i pulled the 12-volt supply wire to the air conditioning is on you. Only been able to find one pressure switch that is why it disconnects when you remove the using! 12-Volt supply wire to the compressor, the AC compressor pulley from its compressor drive they were in clutch! Damage to the unit the evaporator and you will first notice no air flow the...

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