Question about 1997 Pontiac Sunfire

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'97 Pontiac sunfire, 2.2L Problem is overheating. I replaced the temp. sensor. Seemed to have solved the problem, but no dice. At idle it will start to over heat, but while driving with air movement it stays in the normal range. I believe it might be that the cooling fan is not coming on. The 30a fuse is just fine. I am not sure how to test the relay if it is good or /bad. I did try to bypass the relay by using a jumper but that didn't turn the fan on. (engine was cold while trying the "jumper" method) Should I try to bypass the relay when the engine is hot? I would like to eliminate all problems prior to changing the radiator cooling fan. Any help would be great. Thanks in advance for the help.

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  • Pontiac Master
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It doesn't matter if the engine is hot or cold when you bypass the relay. The fan should come on. Did you try both ways on the relay. One way is for the fan the other is from the computer. just to make sure. If the fans do not work then it is most likely the fan. I would check the fan when I had it apart. to hard to do it in place. you don't want to replace it if it is not bad. It could be from the computer side . ie. bad connection, bad computer, bad wire. need to check. also to check the relay connect a wire to prong # 30 and #87 Between + and -, you should hear it click, and while it is connected there should be continuity between prongs #85 and #86. Randy

Posted on Nov 10, 2010

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