Question about 1995 Pontiac Bonneville

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Have a 92 Pontiac Bonneville SE, runs "warm" (over 210). Once the engine fan kicks on, it never shuts off. I've replaced the entire fan assembly but new fan started doing the same thing. Is there another sensor I need to locate and change?

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  • Pontiac Master
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Good possibility your radiator is partially obstructed either internally (calcification blocking core tubes) or externally (leaves etc either in front of a/c condenser or between condenser and radiator). When that happens,(internal) heat transfer is lessened and the fan will work overtime to keep the temperature down. Flushing will sometimes help, but chems used are milder than they used to be and often will go around internal obstructions instead of dissolving them.

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

  • 2002 Answers

SOURCE: Have a 1992 Pontiac Bonneville SE, runs

It sounds like your fans and sensors are workong like they should. The sensors work on temperature and should signal your fans to turn on between 109 and 200. They will stay running until the temperature drops back to that temp. You need to find out why your engine is runing warm, 210 is too high as a running temp. Make sure the cooling system isn't low on coolant first. If you still have the original radiator, it might be a good idea to have it flushed to clean out accumulated corrosion and **** . A "reverse flush" is the best. Your thermostat may be sticking if it's original.It has to come out for a reverse flush so make sure they replace it if you do that. It could be a collapsed hose. None of these things are overly expensive to repair but should be considered. I would try these first. Hope this helps.

Posted on Sep 12, 2009

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Have a 1992 Pontiac Bonneville SE, runs


It sounds like your fans and sensors are workong like they should. The sensors work on temperature and should signal your fans to turn on between 109 and 200. They will stay running until the temperature drops back to that temp. You need to find out why your engine is runing warm, 210 is too high as a running temp. Make sure the cooling system isn't low on coolant first. If you still have the original radiator, it might be a good idea to have it flushed to clean out accumulated corrosion and **** . A "reverse flush" is the best. Your thermostat may be sticking if it's original.It has to come out for a reverse flush so make sure they replace it if you do that. It could be a collapsed hose. None of these things are overly expensive to repair but should be considered. I would try these first. Hope this helps.

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