One is for ground and one for the 12-volt power cable. Most modern compressors have a clutch and drive pulley. Doesnt make sense to replace the ac clutch when the compressor has 100k on it or more. Before removing a serpentine V-ribbed belt, make sure there is a belt routing diagram handy or draw one prior to belt removal, to prevent installation problems. Changing the compressor clutch could be the only solution in this case. If resistance is not within specification, then replace the coil or clutch assembly. Finally, check system performance. Internal damage to the compressor can result. When the engine is running, the A/C compressor clutch plate is loose and noisy. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. As well, my blower motor resistor sent bad so I jumped that temporarily so it’s only blowing max air. Thanks ! It is common when facing issues such as fan clutch stuck engaged or fan clutch hard to spin. A month or three later same thing happens. Comment; Flag; More. When i first start the car, the AC engages every time and blows cold. These switches open the clutch circuit in the event that pressures become excessive. Step 3. Special oils are used to keep the internal windings from shorting to the compressor case, and even small contamination with PAG left over in your service equipment is enough to cause total system failure. I swapped the relay to the A/C clutch with no correction. It does however engage when I jump it. 1,808 Posts . Since the lubricating oil is carried by the refrigerant, a loss could cause damage to the compressor if it were allowed to operate without sufficient lubrication. Now, install the compressor clutch rotor and bearing assembly on the front head. AC compressor won't engage clutch - 2002 Ford Escort. Knowing how to manually engage AC compressor clutch will help you skip a visit to the mechanic. Posted by Anonymous on Jun 17, 2011. I know that if an ac compressor won't spin at all that it is locked up, and that is bad, but I thought the ac compressor was supposed to spin when not on/under load. What you need to know about high-mileage cars? When you get the compressor clicking, let's get things moving. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. The thing is that my AC clutch will always engage when engine is cold but will shut off about 15-20 after. So if I continue with the chart (as if the relay isn't cycling, I remove the relay, and jump two of the pins on the harness to see if the clutch engages, but it doesn't. 2007 Santa Fe 3.3 Diagram for AC fusing location and relay system for compressor. Install the compressor in the engine compartment and secure the mounting bolts. When I turn the A/C on, I can see that the clutch is turning the compressor intermittently & it appears that the belt is sliding on the pulley. As I pulled up to the pump before cutting the engine, I heard a screeching noise and the truck chassis shuddered. On off A/C switch in passenger compartment does not light up. It took a while but the level did come up and the cool air did start to blow in passenger area. With handle out, it *tries* to on occasional rotations to turn the two gears (big and small bevelled gear), but most of the time, the flywheel just revolves and does NOT engage the motor. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. The clutch engages, but the compressor turns very slowly. The AC compressor clutch often has a plug with 2 pins. What is the most common reason for an air conditioning compressor not to engage? I added more R134 to the line and it … Mechanic's Assistant: Are you fixing your Altima yourself? If I disconnect the pressure switch on dryer clutch stops. System has freon in it. Ohm check the ac clutch to see if it’s shorted, Your email address will not be published. Stratt. In addition, pulley misalignment can cause the belt to enter the compressor pulley on an angle, also causing noise. I'm trying to figure out why my clutch won't engage on two-stroke. 1 Answer Blows hot air clutch does not engage compressor. But when the A/C didn’t work, it’s hard to spin them. Tighten the forcing screw against the puller pilot to remove the coil assembly. I put 12v across the compressor, it made a quiet click but the clutch did not engage. These articles, questions and comments are very time consuming so even a small donation gives me motivation to keep educating automotive owners. Since the Shaft of the AC Compressor is mated with the A/C Hub, once engaged, it begins to pump refrigerant in the system. Jun 26, 2012 | Cars & Trucks. Check the compressor belt(s) for wear and proper adjustment. I checked the pulley without the belt & it spins free & noiseless. A/C clutch engages the disengages Discussion in '6.9L ... Just a set of teeth to hold the plate and make it spin. Helm on Aug 17, 2020. ac clutch engages when i turn the air on, but doesnt cycle off. Remove the connector and force it with 12v and ground. I could bearly turn it at all. High pressure conditions can indicate failures such as a damaged compressor, refrigerant overcharge, condenser restriction, stuck open expansion valve, clogged orifice tube or receiver/drier. Your email address will not be published. if i turn the air off, then it disengages as it should. This eliminates the load it places on the engine, as it is most often assumed that the pedal on the floor means it is more important to go fast at that moment than to remain cool inside the car. VIN number 1N6ED27T3YC400020. My car has 234565 miles. To prevent this from happening, many systems are equipped with high-pressure cutout switches. The most modern compressors are of a multi-piston design, ranging anywhere from 4 to 10 cylinders. Added refrigerant. Active 1 ... then turn the key and starter will engage and all is good. could it be the ralay? I'm trying to figure out why my clutch won't engage on two-stroke. Car is 2002 PT Cruiser, I'm original owner. The pulley is belt-driven by one or two V-belts directly from the engine’s crankshaft or by a multi-ribbed V belt or serpentine belt. What are the Factors that Affect Car Shipping Cost? Is CKT 459 continuous between these … Worn shaft bearings will build up resistance in the wiring and fail to turn on the clutch. 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. Now functioning as a unit, they drive the compressor as long as the coil is energized. He told us that the best case scenario is 700 bucks for a new compressor/1400 to 1700 if he has to basically replace everything. Once the assembly is properly seated, install the retainer ring. If only the pulley is rotating, the compressor clutch is having an issue, which could be stemming from several sources – a blown fuse, bad clutch oil, low-pressure lockout, or an open wire in the oil. If the clutch does not engage, then check the clutch ground connection and coil resistance. Place a suitable installation tool over the opening of the clutch coil housing and align the installer with the compressor front head. You can hear this when inside the vehicle. Once repairs are made, the switch will allow normal clutch engagement. Check the front side of the clutch to examine its condition. There are several different compressor designs, but all perform the same function: they move, or pump the refrigerant throughout the system, and they compress the low pressure vaporized refrigerant into a high pressure vapor. replaced relay as tapping it would engage the clutch with the AC control on, but no change for normal use. Torque to manufacturer’s specifications. An automobile can have numerous serious problems and a dysfunctional AC compressor clutch is one of them. If the air gap is sufficient, remove the installation tool, and double-check for proper Woodruff key positioning. What have you tried so far? If replacement is necessary, loosen the belt tensioner or compressor pivot, move the tensioner or compressor to eliminate belt tension, and remove the belt. Turn the center screw of the puller in on the puller body until the clutch plate and hub have been separated from the shaft. Then compressor starts again and all back to normal. I then jumped the low pressure cycling switch (near the accumulator), which caused the fans to spin while the compressor was running. The AC has never worked for as long as she's owned the car. I was able to jump the compressor so the clutch engaged, however, the fans still did not spin and the AC was not cold. If the retainer is a C-clip, install the clip. Both the pulley and the clutch should be spinning. Inspect the front of the compressor for oil, which could indicate a leaking front compressor seal. Evacuate and recharge the NC system and check for leaks. Turned off the car and the A/C and tried turning the compressor. Fuse is ok. Posted by Anonymous on Jun 17, 2011. If I run the compressor right to the battery it will stay on until I unplug it. The AC clutch engaged and the hi pressure line would get sweaty ice cold. The clutch prompts the drive shaft to start rotating once a certain rotational speed is reached and allows the engine to run without always rotating the drive shaft. Never pry the belt from its pulley. The clutch on my AC compressor will engage when I start my truck up but after about thirty seconds it will stop and not come back on until I turn my truck off and back on again. I have an open coil. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. If the trimmer engine runs, but the trimmer head does not spin when the throttle is engaged, the clutch may be broken. A bad AC compressor clutch needs immediate fixing. If the clutch engages, then check the power supply to the clutch, including the system protection devices and electronic compressor controls. I have replaced expansion valve, dryer, Freon. On some compressors, the bearing and rotor must be replaced as an assembly. Then look at the front of the compressor clutch. A delay can cause serious damage to the air conditioning system and the engine. AC Clutch won't engage 96 Legacy Sign in to follow this . Compressor spins and doesn't disengage. 9 people found this helpful. Drain the compressor of any oil it contained during shipment. The throttle position sensor reports to the engine management computer on engine demand conditions. Starter won't spin. Why AC clutch won’t engage. Today a cheap iPhone WiFi obd2 reader showed up and with basic software, I only got a fault code for the fuel charcoal canister vent low voltage or something like that. Second, connect the fused jumper to the same side where you unplugged your wire connector. Replaced starter with a remanufactured. ”If your car AC starts squealing as soon as you turn it on, you could have a cracked or broken AC belt, faulty AC compressor clutch, or faulty AC compressor pulley and bearings. Disconnect the pressure hoses from the compressor and plug the hoses to prevent system contamination. 05 Tundra SR5 4.7L AC clutch engages but Compressor won't spin. Some vehicles are equipped with low-pressure cutout switches. Bad for the car to start with compressor on? If the clutch fails to engage and spin, but you hear electrical buzzing or clicks inside, it indicates an internal clutch short. Look into This! If the retainer is a bolt or a nut, hold the clutch and hub with the appropriate tool, and install the bolt or nut. What Is Shift Lock Release And How To Use It? This car has only one port with schrader valve for adding freon. CONTACT INFO:Martin Hand  - (503)704-4687Cara Rayburn - (971)344-4214martin@mdhmotors.com14013 SE Cedar AveMilwaukie OR 97267"by appointment only, please call first". Most likely brke pedal and transmission range selection is coincidental and there is just a problem with the ac circuit. Why You Should Rather Rely On An Expert For Truck Repair. Using low-quality oil could be a reason for failing AC compressor clutch but it could happen even if you use synthetic oil and high-quality coolant. From the leaking refrigerant to the bad compressor, even a tiny fault in the HVAC system can make you face difficulty with your AC. Before starting the next step of diagnosis, you should know that a low-pressure switch can create problems with the compressor clutch’s relay in some car models. If the clutch plate and hub are fastened to the shaft using a bolt or nut, hold the clutch plate using an appropriate clutch hub holding tool and remove the bolt or nut. Just blows out warm/hot air. How can I force the clutch to engage so I can recharge the circuit? Being low on refrigerant will have your compressor working twice as hard to try and cool the air. A stationary electromagnetic coil is attached to the face of the compressor, behind the pulley. But then as soon as I begin lifting my foot off the brake, the AC switching off routine begins again. After the compressor is removed, clamp it in a suitable holding device with the clutch facing upward. The fan still works, but the ac does not come on. The freon level is good, but when I jump the relay for the clutch to engage, I’m not getting very cold air. ... You'll continue to have good enough pressure so the clutch engages but not enough to cool the car. If it does not, shut the engine off and disconnect the negative battery cable with a socket. Comments: I 've checked my system and there is no gas in it. Reconnect the electrical connectors. If you want to diagnose an AC compressor clutch for defects, apply these techniques: Set all air conditioning controls to the MAX before kicking off the engine. Install a new belt by correctly positioning it in its pulley grooves. You can also subscribe without commenting. 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