Question about 1987 Buick Century

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My radiator fan won't kick on

I've replaced the relay for the fan motor, but fan still not working. I can hear a click like it wants to start turning, but the fan won't turn. I can spin it by hand so I know it isn't locked up. What do I do next?

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  • Buick Master
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Unplug the fan and hot wire it to the battery if it dosen't come on, replace it. it does not need to be frozen in order not to work.

Posted on Jul 28, 2009

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Well, this is a pretty basic system, You have a temperature switch, a relay, fuses, and the motor. If you can find the fan relays and have a test light, remove the relay and verify that you have 12v going to the relay. Then locate the temp switch and verify you have 12v to it. If no one either of these check that the fuses are good. If the fuses are good and you have power to everything make sure your switch is working by using an ohm meter. unplug the switch and take a reading between the poles that are in the switch, start the engine and let it warm up and keep taking reading as it warms and look for the ohms to change, or get lower. you should end up with continuity at the switches set point that should be somewhere between 180-215 depending on your vehicles spec. If the switch is good you should be able to hear/ feel the relay click when you plug the wire back onto the switch when the engine is up to operating temp and the switch is active. If the switch does not close at temperature replace the switch, if the relay does not click when the switch is active replace the relay. If the fan still does not work then you might get some extra wire and make a jumper that can go from the battery to the plug on the fan itself and make sure the fan runs.
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