Oldsmobile 1999 Aurora Repair Manual
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1999 Oldsmobile Aurora Repair Manual
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Oldsmobile 1999 Aurora Headslights
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The fan should work off of the water temp. The fan will come on and off to keep the constant temp on the cooling water.
If equipped with a second fan it is probably for the AC and will run when the A/C is on. If you think the fan should be on. Then If you know where the fan relay is check to see if it is hot, if real hot the relay may be going bad. Hope you know this when you turn the car off the fan can still come on if the water temp is to high.
My thought fan going bad, temp sensor or relay may be the problem. If you can touch the fan motor metal housing and it is real hot the fan man be going bad, remember the blades can start at any time. Answered on May 01, 2016.