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Which relay switch is the coolant fan plugged into on a 1990 Buick Century 6 cylinder?


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2007-04-27 14:35:40
2007-04-27 14:35:40

On mine, it's the fourth relay from the inside out. In case they are in a different order, it should be the relay with two large wires and two small wires coming into it. One of the large wires is power and the other goes to the fan. One of the big wires should be purple with a black stripe. Spray WD-40 into the socket before plugging back in. This has been a BIG problem spot for GM. The wiring, not the relay, is what causes the problem. the contacts get hot and lose contact, then get hotter and quit working completely. I your connector looks burned, it may still work if you use the WD-40. The relay may still be good, too. This cost GM a lot of head gasket repairs due to stupid engineering and overheating. Typical GM.


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