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How do you bypass a radiator fan relay so the fan will run whenever the engine is on?
Wiki User
∙ 14y ago
A temporary fix would be to run the power for the fan directly to the battery. You would need a toggle switch to make it easier on yourself. Find which cable belonging to your fan is the one that conducts the power, on my car its the black and red one. You'll have cut off some plastic off that wire and then connect a good a wire from that one to the toggle switch, then run a wire from the toggle switch fo the positive post on your battle. The switch is need to be able to turn the fan on and off so you will have to find a way to run the switch into the cabin.
Wiki User
∙ 14y ago
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How do you bypass a radiator fan relay so the fan will run whenever the engine is on a 2000 Chevy Cavalier?
This is unwise, an engine that is not near 195 degrees is not running efficiently. The ECM and BCM control the fan.
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By running a ground wire-(jumper) across the terminals on the fan motor relay. Find the terminals that connect to the relay's switch, and short them out like the relay would do. Doing this will burn the electric fan motor out very quickly. Your best bet is to replace the relay and possibly the coolant temperature sensor. The sensor is about $16 and the relay about $14 and the fan motor about $38-$50 at Autozone.
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Nevermind. The problems turned out to be the dash cluster is bad. No reason for the fan to come on as the engine never really gets warm. Mr Goodwrench proved the dash read 35 degrees higher than it should. BTW; There are two relays in the fuse holders on the left fender. One is for the radiator fan, the other is the inside compartment heater fan. You could just swap them IF you suspect a bad relay.
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