Question about 1994 Pontiac Sunbird

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Fan on the radiator stopped working and now it gets hot but if you wire the fan direct it works fine so something in the car is not telling it to turn on? Please help

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CHECK FUSE AND RELAY.IF THEY ARE OKAY.A BAD COOLANT TEMPERATURE SENSOR.WILL CAUSE CAR TO OVER HEAT.BY COOLANT SENSOR BEING OPEN NOT SIGNAL TO PCM TO TURN ON COOLING FAN AT 190 DEGREES.THE ENGINE WILL OVERHEAT.

Posted on Sep 07, 2009

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Temp switch, located in cylinder block or intake manifold

Posted on Sep 07, 2009

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Fuse or relay is where I'd start

Posted on Sep 07, 2009

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Relay or coolant temperature sensor most likely.

Posted on Sep 07, 2009

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The fan is turned on buy a raditator fan switch belive it or not. On some cars this will also be known as the coolant temp switch, and used for both the computer and the radiator. They are reasonably priced and easy to change. You will normally find it located near the thermosat housing, right were the upper hose conects to the engine.

Posted on Sep 07, 2009

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Hi, i replace the thermostat and water pump flashed the radiator has coolant but still overheating, what else could it be its golf 4 tdi diesel 2002. Thank you


Radiator may have rust/salt deposits inside, if that is case its cheaper and better to change the radiator. Also for future don't use normal tap water in radiator, use a coolant + ph balanced water meant for radiators to reduce salt buildup inside radiator.

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