1994 Pontiac Sunbird LE Sedan radiator cooling fan not working.
I need help troubleshooting and diagnosing the problem. The fan does not come on when I start the engine, nor does it after it has idled for a while. I checked the fuse first, but it was ok. I don't have the wiring schematics, nor do I have any experience diagnosing nor troubleshooting.
Re: 1994 Pontiac Sunbird LE Sedan radiator cooling fan...
Above is the diagram for a 4 cylinder. It appears that you might have a fusible link which looks like a regular wire instead of a regular fuse. If you have A/C on your car you can turn it on and this automatically should turn the cooling fan on. If I remember correctly these cars have problems with the Coolant temperature sensor located near the thermostat. It will have one yellow wire going to it. You can also try to swap the cooling fan relay with the horn relay or another relay that looks similar under the fuse block. There should be a diagram of the fuses and relays under the cover. Try with the engine off and key out try to turn the fan by hand. If it does not move freely the cooling fan motor is bad. Other than that you will have to bring to a shop to have the circuits tested... Good luck.
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Follow the wiring back from the fan motor, the relay is often found at about the height of the bottom of the radiator on the inner fender. Check that connection is clean and free of corrosion. Check that the fan works by taking two trailing wires directly from the bettery terminals and connecting then to the fan motor directly. Use a voltmeter and check the voltage at the relay when engine is cold and shortly after the radiator top hose from the engine becomes hot (the coolant sensor should have signalled for the fan to switch on at this time). No voltage indicates a break in the circuit or faulty sensor. Voltage but no fan indicates faulty relay
If you have changed the thermostat, next step to check is the cooling fan operation, make sure the fans are coming on, especially in stop and go traffic. Obviously make sure the coolant level is topped up, both in the reservoir and the rad. If low check for leaks under the waterpump when running. If all else fails you probably have a broken head bolt or blown head gasket.
There is a temp sending unit on the engine, it sends a signal to the engnie computer which provides a ground to turn on the fan relay. You might want to check the relay for the fan, I believe its on the passenger side just aft of the strut tower but dont quote me on that.
if you replaced the relay because it melted that means there was a short in that circuit. if the water pump is circulating the coolant properly then there is either a faulty temp sending unit on the intake manifold. a faulty sensor on the fan itself, or there is a blockage in the system. if all of these are ok then that means that you have a air bubble in the system. to correct this start the engine with the radiator cap off turn your heater on to high fan high heat and run the system. when the engine reaches temp the upper radiator hose should get real hot ,if it doesn't then the thermostat did not open. replace the thermostat. if it gets hot then let the engine run for a bit top off the coolant shut vehicle down and replace radiator cap this should solve the problem
what i do is draw me a diagram before i take the old belt off , but if you have an auto zone near you they will print you out a diagram for free and if you do not have one then go to your local library and there you can get pictures and diagram on how to repair your car