Could use a little more info but in most cases the system has lost freon which means you have a leak. There is no reset. System needs to be tested, repaired and recharged.
To reset the AC compressor in a 1996 Cadillac Eldorado, first, ensure the engine is off and the AC system is turned off. Disconnect the battery for about 10 minutes to reset the vehicle's electrical systems. Reconnect the battery, then start the engine and turn the AC back on to see if the compressor operates normally. If issues persist, it may indicate a need for further diagnosis or repair.
might need to reset the problem indicator
To reset the AC compressor on a 1993 Cadillac Eldorado, first, disconnect the negative battery cable for about 5-10 minutes to reset the vehicle's electronic systems. After reconnecting the battery, turn on the ignition without starting the engine, then activate the AC system to the coldest setting. This should allow the compressor to reset itself. If problems persist, it may indicate a more significant issue that requires professional diagnostics.
it is probably the bearings going out in the ac compressor pulley or belt slippage. the reason it is different when it is on is because the belt is not under "load" or has resistance.
The ac compressorThe ac compressor
To reset the AC compressor on a 2003 Cadillac Seville SLS, first, disconnect the negative battery cable for about 10 minutes to reset the vehicle's electronic systems. Reconnect the battery, then start the engine and turn the AC to the maximum setting. If the compressor still doesn't engage, check the fuses and relays related to the AC system, and ensure the refrigerant levels are adequate. If issues persist, further diagnosis may be required.
look for the ac line going in to the compressor or the port on top of comp
the ac belt or the compressor bearings are going bad
Assuming you are asking about the ac compressor, there would be two possibilities, blown fuse or low on freon.
you have to remove neg.batt cable for 1 minute.may have to do a couple of times to reset ac controller
If the AC compressor is engaging it could be the heater control valve is stuck open. If the AC compressor is NOT engaging you probably have a problem with the controls, a sensor or the compressor.
It is possible the air compressor is bad. You will need to replace the air compressor, so the air will work again.