Question about 1999 Saturn SL

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I have a comlicated one

I have a 1997 saturn that the fan will no come on by itself i have to turn the ac on for the fan to come on there is nothing wrong with the themostat, fan motor, and the only other thing i can think of because i can't find any thing else is the coolant temperature sending unit but the thing is the unit controllers the temp gauge that works. question is does the ctsu control the fan relay to tell the fan to come on or is there another sensor that controls that? and if there is where is it located?

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  • jasonivan320 Dec 19, 2008

    in another forum i heard the same problem but the guy say he solved the problem by changing the expansion tank cap for a new one it was faulty and then the fan started to work after.could that be another answer?

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  • 5,158 Answers

Two things to check.... the sending unit and the relay for the fan.

I remember my dodge omni's fan didn't come on till near meltdown... but the temperature gauge never said it was that hot.

Posted on Dec 19, 2008

  • Roberta Smith
    Roberta Smith Dec 19, 2008

    wouldn't hurt to try it.... let me know how you make out

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