Question about 1999 Oldsmobile Alero

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2002 olsmobile alero w/ 3.4 litre engine overheating

Cooling fans only work when a/c is on and turn slower than normal.have already changed cooling sensor; checked fuses and relays. cooling sensor has 2 wire's, a red w/ blk stripe and a solid yellow. could only get 4.91 volts out of red wire and 1.78 out of yellow wire. have also bled coolant system.

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  • CJ Kelly Feb 14, 2009

    I have a 1999 Olds Alero, and I am suffering exactly the same problem. Have you found a solution yet?

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Replace thermostat . before putting in a new one.remove both hoses on radiator .flush out radiator then your block where thermostat go .remove the hose to water pump. use garden hose .dont turn it on too high. just enough to get the rust and gunk out of block.flush at the top where thermostat go.watch the water . from your water pump. it look dirty .keep flushing until you see clear water and a good flow not a tiny flow .make sure your water is too high. also change coolant sensor. this should help i had the same problem.

Posted on Mar 17, 2009

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  • Expert
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Your fans need replacing try hooking them up straight to battery to check if they spin fast its not the fans but the wiring.

Posted on Feb 26, 2009

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