All of the fuses are good. Switched coolant fan (works great) relay with the A/C relay and everything the same so it's not the relays. Can't find the low pressure switch. There is a plug on the high side but it has 3 terminals and can't be jumped to activate the compressor. Anyone know anything else I should do before changing out the compressor because I have a feeling that it is not the problem?
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the temperature sensor is next to thermostat housing disconnect the sensor and start the car if the fan works right away you have a faulty sensor also make sure there is good ground to the body and engine
Replacing part's is not the way to diagnose ! Hooking up a OBD 1 scan tool an viewing engine sensor data parameters is . Did you do this ? , What engine ? 2.8 , 5.0 or 5.7 l
Coolant fan control switch at 238 degrees closes an supply's a ground for the cooling fan relay ,their by energizing the relay an closing the contacts sending B+ voltage to the cooling fan Or the PCM does ,depends on which engine . There is a fusible link that supply's B+ voltage for the fan it's self . A fuse for the control side of the relay . Did you use a DMM - digital multi-meter an test B+ power circuit's & ground circuit's . Maybe your best bet would be to take it to a qualified repair shop .
IF CAR OVERHEATING AT STANDSTILL OR IDLING IN A LONG TRAFFIC LINE.COOLANT FAN NOT TURNING ON.MORE LIKELY COOLANT TEMPERATURE SENSOR NOT WORKING.USE A SCANNER TO CHECK COOLANT TEMPERATURE WHEN ENGINE HOT.IF TEMPERATURE READ LOW COOLANT TEMP.SENSOR BAD.IF SENSOR OKAY.CHECK COOLANT FAN FUSE AND RELAY.ALSO HOTWIRE FAN TO SEE IF FAN MOTOR WORKING.IF NO REPLACE FAN MOTOR.IF FAN MOTOR GOOD FUSE AND RELAY COOLANT FAN MOTOR WIRE CONNECTOR IS DAMAGED OR HAS BROKEN WIRE.
SOUND LIKE FAULTY IDLE SPEED CONTROL OR FAULTY FUEL INJECTOR OR A INTAKE VACUUM LEAK.IF GETTING HOT WHILE STOPPING.CHECK COOLANT FAN FUSE AND RELAY.IF BOTH GOOD.HOT WIRE COOLING FAN TO CAR BATTERY USING JUMPER WIRES.IF COOLING FAN DONT WORK REPLACE THE MOTOR.IF FAN WORKS.COOLANT TEMPERATURE SENSOR IS BAD.ALSO HAVE CAR SCANNED TO SEE WHAT CAUSING CHECK ENGINE LIGHT TO COME ON.
Does the temperature gauge on your dash work okay?
The coolant temperature sensor provides a signal to the PCM to tell it when to turn the fans on and if its a three wire coolant sensor it also feeds the signal to the gauge on your dash and if the gauge on your dash is not working, it could be a clear sign that the sensor is dead.
However, to start with the simple things, first check the fuses that power the fans, it will be a large fuse probably in the under the hood fuse box and maybe in the 30A range. Check the fan relays as well.