radiator fan not working

Asked by GuruDCQF3F Jan 26, 2025 at 10:59 AM about the 1997 Cadillac Seville STS FWD

Question type: Maintenance & Repair

1997 cadillac sts radiator fan not working. Which relay (3) should i replace?

2 Answers

158,155

With the engine cold, unplug the coolant temperature sensor and start the engine. The check engine light will come on, ignore it. The radiator cooling fans should come on immediately at high speed. If they don't, you can replace all three fan relays in the underhood fuse box, they're cheap. The four pin ones are for each fan, low speed. The five pin one is for both fans, high speed. On a side note, if the engine is overheating it's most likely a blown head gasket. All Northstar engines blow head gaskets sooner or later. To confirm this have the coolant tested for exhaust gasses. If the test is positive, don't go any further with it. At this point it's not worth fixing. Jim

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