Best if you own a compressor, air tools keeps the clutch from turning. If no compressor, mount it in a vise to keep it from turning and remove each bolt, can be tricky as they are mounted together but turn seperately when activated.
Do you mean that the AC clutch does not engage the compressor? Or do you mean that the AC compressor won't turn even if the clutch is engaged? If the compressor is siezed and will not turn even if the clutch is engaged, the only choice is to replace the compressor. If you can turn the compressor by hand (understand that the belt pulley will turn freely with the engine if the clutch isn't engaged) but the compressor clutch isn't engaging, it might just be out of refrigerant. There is a sensor, usually somewhere near the receiver/dryer) that detects the "low side" refrigerant pressure. Once the refrigerant pressure at the sensor drops below a specified level, the compressor will not turn on. In other words, if the compressor clutch won't engage it might just be out of refrigerant.
The AC clutch is on the front of the compressor where the belt rides. When power is applied to the clutch it engages to turn the compressor. It is basically a magnet a/c compressor clutch is the ound thing on the front of the compressor with pulley wheel attached. this clutch is an electro magnetic clutch that when electricity is supplied, engages so as the a/c compressor is driven ,which can then pump freon thru the ac system
Well, the question is a bit vague. Is the flywheel to the compressor clutch turning? Does the compressor clutch engage? What exactly is it doing? There are several possibilities here.. a bad low pressure sensor, a seized bearing in the compressor, an overcharged refrigeration system.. kinda difficult to narrow it down without knowing specific symptoms.
First thing to do is check that the compressor clutch is engaging, when it is not working properly. If the outer pully is turning, as it does whenever the engine is running, and the inner part of the clutch is not turning, that could be your problem bad clutch or electrical connection . The inner and outer parts of the clutch need to be turning for the compressor to function. Have someone turn the AC on and off while you watch the clutch.
First check your fuse for your AC in your fuse box, make sure it is good. Make sure your cooling fan is turning on when you turn on your AC, if not it could be your fan relay. If the AC compressor fan clutch is kicking on and off then it just needs freon. If the AC compressor fan clutch is not turning then it could be completely out of freon due to a leak, or you need a new AC compressor.
If the clutch on the ac compressor is not turning freely then the drive belt will either slip or not allow the engine to turn over. But most likely, the belt will slip and the engine will still turn over.
An air conditioner clutch will not engage without voltage. If it doesn't engage, the compressor will not turn.
You have a cycling clutch compressor. Turn the AC on max, let the car for five minutes or so, go look at the compressor. You should see the clutch engaging and disengaging the compressor as the pressure builds and drops.
Most automotive AC compressors use a cycling clutch compressor, where the clutch is engaged by pressure switches which will engage the compressor clutch when the pressure reaches a predetermined low level, and disengages it when it reaches a predetermined high pressure.
The AC clutch on a ford FS-10 is mounted on the front of the compressor. The clutch is removed by using a puller after the clutch nut is taken off. Mount the puller, and turn the center bolt. This will pull the clutch off of the compressor shaft.
It could be the AC compressor. With the engine and key off, try turning the compressor by hand. The belt should be connected to a pulley that drives the clutch. With the engine off the cluth is disengaged so you should be able to turn the inner part of the compressor pulley even though the outer part is connected to the belt. If it won't turn at all, it's probably siezed and you need a new compressor.