It's a lot easier if you replace the entire compressor instead of the clutch. If you are not set up to measure the air gap necessary for the clutch or you do not have recovery equipment for the refrigerant I would suggest you take the vehicle to a certified service center that has all the tools and special gauges to repair your vehicle. Remember, it is illegal to release any type of refrigerant into the atmosphere and it wouldn't be environmentally friendly if you did such an act. Ford uses Sanden and f6 compressors.
Bad A/C compressor clutch. Bad A/C compressor clutch.
It is possible to replace the air conditioner clutch without replacing the entire compressor if you can find somewhere that sells just the clutch assembly and can get the appropriate tool to remove the pulley to get to the clutch. Try buying a repair manual and looking in there.
If the clutch disengages properly then the compressor should not be running. Most likely the clutch itself is bad instead of the compressor.
The air conditioning compressor clutch relay is located on the bottom of the air conditioner compressor. The relay switch will be labeled.
Advice is to replace compressor the clutch goes bad only when the compressor goes bad on this model. They are sold to guys that rebuild compressors. Napa has the best price for clutches if you still want to try. Ebay there is a guy that sell rebuilt compressors for just a little more than the new clutch.
This requires special tools to remove and install the ac clutch and bearing. The air gap on the ac clutch must be done during install.
What specific kind of vehicle do you have? It does sound like the clutch may be bad, but we also need to know what you are working on. You need to run power straight from the battery to the compressor. If is still does not engage then you need to replace the compressor and clutch, they are dead. If they do engage, then you have a wiring or computer issue.
There is a special tool that will pull the clutch assembly off of the compressor, available at your local parts store!
go to 99intrigue.shutterfly.com/compressor. Get clutch remover and installer. Get feeler gauge. Remove serpentine belt with 1/2" breaker bar. Measure air gap in clutch. Remove shaft nut. Remove clutch with remover. Remove outer snap ring. Remove pulley with pry bars or remover. Remove clutch coil with pry bars or remover. Replace new coil and pulley. Replace snap ring. Replace clutch, maintaining air gap. Reinstall nut. Reinstall belt.
Get a reman compressor and don't bother dicking around with the lame one.
what is the responsibility of the compressor in the air condition system
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.