My raidiator cooling fans will not turn on to cool down my 95 Buick Regal Custom 3.8. It has 113,326 miles. I have replaced the engine temp sensor, replaced both fan relays. After hard wiring both fans they both work, but I still cannot find the problem.
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Re: cooling fans will not run
Most GMs use a relay package to turn on the fans. That is often controlled through a processor package. Very complicated...if yours is one of them. You will need Mitchell's manual or equal to trace this to see if you have all the signals.
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It is normal for the fan to stay on after the engine is off. The clicking is not. Once the negine is cooled down and the fan is not running. check the fan by spinning it and try to locate the clicking noise. Make sure the fan doesn't wobble. If it does then the bearings are going out, replace the fan. The clicking could be something lodged in the shroud, clicking against the fan blade. Like a stick.
If there are no leaks, a couple more things to check are a clogged radiator and a blown head gasket. Take the radiator cap off and start the engine. Let it warm up and look inside. Does the coolant flow in from the upper hose and go down the cooling tubes? Are there deposits inside? With the radiator full of coolant to the cap neck, are there any bubbles coming up the neck? Bubbles of combustion gas indicate a blown head gasket.
Lack of flow indicates a clogged radiator. A badly clogged radiator is best replaced rather than flushed. Let me know if you need instructions or have more questions.
First check fuse in engine compartment. Use a test light to check for voltage at the fan connector. If no voltage at fan with engine running and hot, replace fan relay in engine compartment relay box. If there is voltage at fan, but fan doesn't run, replace fan. Any questions, please reply.
If she paid someone to replace her radiator she should take it back. There are temperature relays around the fan I believe and the fans are not working. These are right in the area of the radiator. Someone must have disconnected the fan or the relays were failing before the radiator was working. Either way, the car is not cooling and she sought a solution to that problem. She was charged and the problem is worse. Go back to the radiator place.
Did you try jumping the cooling fans with direct power to see if they worked and the fan motor isnt burned out?You can turn the a/c on while running the car and it should turn the fans on even if the car isnt heated up.