Cooling fan Car gets hot. Cooling fan works good I had to wire it to run when startcar. I changed thermostat, relay, and temp sender. Car stays cool orwarm about or just under half mark. When fan not wired the way I haveit, it gets almost to hot line sometimes fan works the way it should isit the computer? 1997 sunfire gt

Sounds as if,the cavalier,may have an internal blown head gasket.

cooling fan works on a temp sensor in the engine block. it only turns on when the temp reaches a set limit and shuts off when it gets below a set limit.. cooling fan components are , fans, fan relay , and temp sensor . best way to test the fans would be to let the car set running and watch the temp till it goes up to 185 -195 deg. at this time the fans should turn on and the thermostat should open and cool the engine back down. also when ever the air conditioning is on so should the cooling fans be on. if the fans do not run the check all components till you find the broken one. fan relay and air conditioning relay are separate but work the same. and will interchange

your coolant temp sender could be bad. locate the temp sender. this is a 1 wire sensor. the other sensor in the block has 2 wires and starts the cooling fan.

I would first check the fan relays make sure they are good ..If no problem there then i would disconnect the wires going to the cooling fan..turn on your a/c ..that should activate the fan even if the vehicles cold ..see if you have voltage across the wires plug the meter right into the wire you should have 12 volts..if you do then its the fan..if the fan comes on during a/c but dont come when vehicle gets hot,then its probably the temperature senser that tells the fan to come on..Its located near the thermostat.

REPLACE THERMOSTAT BUT IT SOUND LIKE FAULTY COOLANT TEMPERATURE SENSOR.BUT CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD HOT WIRE COOLING FAN IF COOLING FAN WORKS.PROBLEM COULD BE FAULTY COOLANT TEMPERATURE SENSOR. DAMAGE FAN WIRING OR FAULTY PCM.IF COOLING FAN DONT RUN WHEN HOT WIRED.REPLACE FAN AND MOTOR.

SOUND LIKE COOLING FANS NOT RUNNING CHECK AND SEE DOES COOLING FANS TURN ON WHEN ENGINE OVERHEATS IF NOT CHECK COOLING FANS FUSE AND RELAY IF BOTH CHECKS OUT GOOD HOT WIRE COOLING FAN.IF IT WORKS.PROBLEM COULD BE COOLANT TEMPERATURE SENSOR- PCM- AND OPEN OR SHORT IN WIRES.IF COOLING FAN DONT WORK WHEN YOU HOT WIRE IT PROBLEMS THE FAN MOTOR.

CHECK COOLING FAN FUSE AND RELAY.IF BOTH GOOD SCAN CAR TO CHECK COOLANT TEMPERATURE SENSOR FAULT CODE.THE PCM AND COOLANT TEMP. SENSOR IS WHAT CAUSE FAN TO RUN AT CERTAIN TEMPERATURE.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN REPLACE FAN MOTOR.IF FAN RUNS YOU HAVE SHORT OR BROKE WIRE IN THE COOLING FAN ELECTRICAL CONNECTOR.

The fan will only come on when the water temp. reaches about 80 digrees with the new water pump the temp. is staying low and the fan is not needed. Drive it a while checking the temp. guage if it over heats and the fan doesnt com on then you have a problem if not all is o.k.

check the temp sender as this is what activates the fan

hi the temp" sender "in this case is a thermostatic switch normaly with 2 connections put an ohm meter across the connections when engine is cold it will show nill or full scale leave meter connected run motor up untill it is hot meter needle should have moved 1 way or the other if it did not the relay is at fault chris merlinv12