This happens to keep the fluid in the compressor viable. If it sits too long, it can become unusable.
Is to disengage and engage
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 compressor clutch on a Ford Explorer Sport Trac is primarily controlled by the vehicle's engine control module (ECM) or the air conditioning control module. These modules monitor various factors like temperature and system pressure to engage or disengage the clutch, allowing the compressor to operate only when needed. Additionally, the system may include pressure switches that help regulate the clutch operation based on refrigerant pressure levels.
The air gap for the compressor clutch plate on a 2002 Honda Civic Si is typically around 0.020 to 0.040 inches (0.5 to 1.0 mm). It's important to ensure this gap is properly set to allow the clutch to engage and disengage effectively, optimizing the air conditioning system's performance. Always refer to the specific service manual for your vehicle for the most accurate specifications and adjustments.
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.
The A/C Compressor may not be charged with frion if the A/C Clutch does engage, or it may not engage due to fact it's not sending 12v to the electronic wiring. First start the engine and turn on the A/C, watch if the clutch on the compressor engages or not.
To engage or disengage the engine from the transmission.
clutch
Low or no refrigerant Blown Fuse Defective pressure switch Bad clutch on compressor Selector switch
The clutch will not engage ,you will not be able to shift./// the clutch will not (disengage ) making it almost impossible to shift gears
An air conditioner clutch will not engage without voltage. If it doesn't engage, the compressor will not turn.
You will have to figure out why: This the 90% of the time failur: Is there Freon in the system, if there is not a minimum pressure, usually 17 PSI, the compressor will not run. Is the compressor and clutch capable of working? Is the fuse in good shape.