Why should you not drive on a flat tire? At the mechanic, the repairman will check the serious level of the compressor clutch, then they may … I do have pressure on the high side, but I don't know how much. It may not be difficult to diagnose a clutch compressor’s “malfunctioning”. To determine if the clutch is operational or not, try these techniques: Here are some of the possible reasons why the clutch does not engage the compressor: To verify whether the fuse is not busted, turn off the engine of the car and disconnect it from the system. Once the canister is drained, unscrew the switch from the canister with a wrench. That should stop the battery drain. Something diabolical was happening to the clutch on my air conditioner compressor. Checked voltage at the compressor, shows 12 VDC. With the ac off, you'll see the front part of the compressor (clutch) not moving. Disconnected the switch connector to see if it affected the clutch, which it did not. You can try … Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. Investigation shows low side pressure high (No high side gauges) and when the car is on, the ac pulley is spinning. It is an ominous sign when the clutch engages but the compressor does not spin. Changing the compressor clutch could be the only solution in this case. There are repair kits available online such as the R410A Refrigerant Repair Kit for charging refrigerant or the Du Pont Refrigerant 134A. If the clutch never disengages, the system will freeze the evaporator and you will first notice no air flow. Essentially it is like it is working on a 50% duty cycle, starting and stopping every a few seconds. It started by not cooling under 1.5k rpm but would cool in gear driving above. Sometimes I think all Subarus are Outbacks. The clutch is located in front of the AC compressor. Sufficient level is indicated by a red line in the sight glass. As the vehicle ages, the system sometimes develops a leak. That makes operating the air conditioning system in your car more user-friendly and convenient. As for where to look. Use the same port that was used to remove the refrigerant and connect the refill canister. If so, then the clutch is worn. I noticed my A/C compressor stays engaged when I turn the A/C on. You've got a short somewhere supplying power to that wire. Which makes sense and not the ECM controlling the compressor clutch. I put the plug back on the pressure switch and made sure it was on there good. A/C clutch engaging and disengaging. Checked voltage at the compressor, shows 12 VDC. But, sure you can’t use your car’s air conditioning system when this happens. The units … If the level appears way too low the red line, you must add oil. The next morning, i popped the hood, started truck and turned the AC on, cranked on high. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Save … The clutch keeps the compressor activated, if it breaks, the compressor will not be able to receive the engine power anymore. Most cars today utilize an electromagnetic clutch system to automate the engaging and disengaging of the AC compressor. The compressor is lubricated by refrigerant oil. The compressor will not cycle off when the A/C is on. Previous Next KK Lifer. Once you turn on the AC the center part of the compressor, the AC clutch should engage and start to rotate with the pulley. I checked the control knobs and they were in the off position. Sponsored By: Jan 3, 2021 at 10:43 PM #21. It would not disengage. AC System Repairs Your vehicle’s AC system is far more complex than you might think, and it relies on a plethora of parts and components to operate properly. I installed r134 while running the ac. The center part (the clutch) should be engaged and should be spining along with the pulley. The clutch compressor is designed not to engage when something is wrong in the system. Higher Temperatures Than Normal In The Cabin. Two types of high-pressure cutout switches. 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. 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. With the connector off of the compressor, the clutch still does not disengage. Air conditioners operate as a closed system. Jump to Latest Follow 1 - 20 of 40 Posts. 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. Ron, ASE Certified Technician. what's going on? A/C compressors are difficult to work with because of the refrigerant stored inside. The three components of a car’s air conditioning compressor clutch When power energizes the clutch coil, the magnetic field pulls the clutch in towards the pulley. Watch that clutch and see how often it engages/disengages. A bad AC compressor clutch needs immediate fixing. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. Add the type of oil compatible with the compressor. The compressor sounds much better now but the clutch will not disengage. You can check your car’s AC manual for the correct pressure level. The unit will work for about a week and then go bad. 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. Clutch will not disengage. Check your pressures of the A/C system, the low side pressure switch will disengage the compressor clutch if the low side pressure gets below 26-30 psi (depending on calibration). Start the car and let it run to ensure the compressor clutch disengages. Does anyone know what could be causing this malfunction? It seemed possessed! On the contrary, the AC continued to work properly. But there are only a few pieces to the entire AC system. The AC compressor clutch is the first thing that moves every time you turn on your AC. Copyright 2021 Leaf Group Ltd. / Leaf Group Media. cabin ac button has no effect meaning it doesn't load the engine. I was mistaken, it is a Forester, not an Outback. 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. Your lines will not freeze over, although the constant running of the compressor does what never-ending work does to all machines, wears it out faster. Plus, the clutch release bearing will constantly have pressure on it along with rotational twists causing excessive heat build up. Answered in 3 minutes by: 4/10/2010. Search Auto AC Forum Archives. BUT, the ac relay is the off/on for the power. When this is activated, a current passes through the coil creating a very powerful electromagnetic force (EMF). The reduced pressure causes the switches to misread the pressure of the refrigerant. Hi Eric, I have a 2004 Honda accord 4 cylinder 2.4l sedan. I drive the car or let it idle for 1/2 hour twice a week. Show More. Theoretically, if an air conditioning system is low enough on refrigerant to disengage the compressor clutch, it’s too low to be recharged with a DIY kit. Leaks allow moisture to invade the system as the coolant leaks. The clutch not disengaging wouldn't be effected by anything other than the air gap. 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. pushrod on . Use only compressor oil that is approved by your AC’s manufacturer. Within a 20 minute span, i realized the clutch never cycled off; it just stayed spinning. The Garage . Now it won't work at all. Forums. The clutch on the ac compressor continues to go bad. To disengage the clutch, a switch must be replaced. Disconnected the switch connector to see if it affected the clutch, which it did not. Ac pulley clutch not disengaging. Turned off the A/C and still have 12V at the compressor. 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. And what turns the ac relay off/on. If you turn the knob to A/C and the clutch doesn't engage and start spinning the compressor, tap on the clutch itself lightly with a screwdriver handle while the rig is running and the knob is on A/C and see if the clutch locks up. The compressor is typically engine driven via the accessory belt, and the clutch on the compressor is used to engage and disengage the compressor. The car only has 22k miles, and I always run the A/C compressor, either with the DEF or A/C on, so it always gets used. Changing the compressor clutch could be the only solution in this case. The clutch either transmits power or not, and it does not work partially. Air conditioners have sensors that determine the pressure and temperature of the refrigerant, starting and stopping the compressor by engaging or disengaging the clutch. These parts, along with other of your vehicles’ components should be properly maintained to assure its serviceability. Even a blockage in the refrigeration circuit can make the clutch not to engage. My clutch did not disengage when I was going to work yesterday. Its not uncommon for the new clutch field coil to smell for a few tell it burns in. January 22, 2019. The clutch on the ac compressor will turn and spark fire along with fumes of burning oil. When a compressor clutch does not disengage, it will cause the refrigerant to build up and freeze the line. A/C compressors are difficult to work with because of the refrigerant stored inside. Sponsored Links Remove Advertisements. is not engaging, you may want to know why and find some answers. Yes, it disengages when the AC is turned off, but while the AC is on, the clutch will not disengage. Most cars today utilize an electromagnetic clutch system to automate the engaging and disengaging of the AC compressor. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. Answer. That makes operating the air conditioning system in your car more user-friendly and convenient. My clutch did not disengage when I was going to work yesterday. It is illegal to drain this into the air; it will have to be drained by a professional company. 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