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check terminals on the ECM
the circuit is when the coolant temp sensor ( not the gauge sender) reaches a predetermined setting , power is supplied to the ECM which in turn activates the fan relay and switches on the fan
there are normally 2 fuses in the circuit
the gauge sender is normally a single wire unit and the sensor unit has 4 wires to it
This is normally the fan relay which is fried. It can be that the fan is pulling too much current , which causes the relay to fry. It is a good thing to change both fan and relay.
If the sensor is faulty, then you won t see coolant temperature on the instrument panel.
Well I'm sure there are kits to wire up electric fans on cars that are not designed for one. You would need a relay and something to turn the relay on. A coolant sensor won't do the trick, the sensor is what tells the computer the engine temp, and the computer decides when to ground the fan relay. You would need a temp switch that is designed to close at say 220 degrees to ground or power the fan relay. The fan motor would have ground and power wires.
Try checking the fuse box under the hood. It should have a fuse marked cooling fan or cooling system. If the car does start, that means the computer isn't out, but maybe there is a bad relay by the fan or in the circuit or even the temp sensor may be bad. The fan won't run until the temp is high enough; usually by the time the thermostat opens.
CHECK MODE RELAY IF BOTH RELAYS GOOD YOU CAN CHECK RELAY BY REMOVING IT FROM FUSE BOX HOOK RELAY TERMINAL 85 TO BATTERY POSITIVE AND GROUND TERMINAL 86 IF CLICKS RELAY GOOD. IF RELAY GETTING POWER GOOD AND THE 30 AMP COOLING FAN FUSE OKAY.EITHER THERE IS A SHORT IN COOLING FAN WIRING OR THE PCM HAS FAILED.THE PCM HAS LOST OR COMMAND RUN CIRCUIT IN PCM SHORTED OUT DUE TO PCM FAILURE.LET DEALERSHIP OR GARAGE USE DIAGNOSTIC EQUIPMENT TO ACTIVATE THE PCM SEE IF IT HAS FAILED.DONT SPEND MONEY ON NEW PCM COULD BE SHORT IN THE WIRING CIRCUIT
IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.
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.
There are three fuses and two relays for your coolant fan. They should all be in your underhood fuse box. They may not be marked "coolant fan", so check them all, (2) 60 amp , (1) 20 amp, (1) 15 amp. If all the fuses are good, you may have a bad fan switch (temp sensor). It tells the fan when to turn on, follow the wire from the fan motor to find it.
the cooling fans are run by a relay it's located in the junction box. check this. there is also a thermoatic sensor located near the fans next to radiator. the fans should free spin when the engine is off this is a good indiacator that it's not the fan themselves. if the relay checks out(run engine and switch the fan relay with the a/c clutch relay when the engine reaches 180 degrees you will feel the upper radiator hose get hot the fans will turn on a short time later iof they don't it's the temp sensor near the radiator if they do it's a bad relay...please rate this thanks