Hey Grady==You don't say what kind of car you have but most don't have relays on the compressor. Ihere is a cycling switch on the accumulator that when it is low will keep the compressor from engaging. GoodlukcJoe
Depends on the make and model of the vehicle. On newer cars check the power distribution box where the relays are located.
Check under the air filter housing for the PCM (power control module) if you could open it you would see about 5 relays on a circuit board one of the relays is for ac compressor. In general change the PCM.
Mabe your compressor is not kicking on for some reason. Check to see if the front of your compressor starts spinning when you turn it on. If it don't check to see if there is power to the wires that go to your compressor. If there is power you have a bad compressor. If there is not check the fuses or relays.
In a nutshell, it's a power source for propelling the vehicle, and powering the alternator, air conditioning compressor, and power steering pump.
The 1991 crown Victoria has several relays group in a relay center loacated under the hood near the master brake cylinder. In this relay center its the air conditioning WOT cutout relay, fuel pump, PCM power relay, and PCM power diode. P.S. defective relays must be replace as a unit.
Look under the hood in the power distribution box and you will see a group of relays and it will be the top one on row one (compressor clutch relay).........
front right hand top side, has a belt drive, look for the hoses that go from the power steering fluid reservoir to the pump just a short distance away. the air conditioning compressor is below the power steering pump.
The fuses and relays are in the power distribution box.jd
The fuel pump relay is located in the back of the glove compartment. The relays under the hood should be for the AC compressor and the HVAC blower motor high speed. Be sure to check the fuses also.
A drive belt will go around the pulley on the alternator . If you have a serpentine belt it will drive all the accessories attached to the engine . Alternator , power steering pump , air conditioning compressor etc .
Most likely, it is a stuck contactor or relay that controls the compressor motor. If the compressor continues to run after the blower inside the house has shut off, the only way to stop it is to kill the power, either at a dedicated switch or sub-panel for the air conditioning, or at your main breaker panel. Turn off the power to the air conditioning and furnace system until you can have the unit serviced.
These relays (For factory installed power windows) Should be located with the power door lock relays, just under the dash on the passenger side of the vehicle, part way behind the kick panel. These relays will be mounted to a bracket.