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1998 gmc sierra heatrer only blows on high

I replaced the resistor, and the problem is still there, the wiring liiks good, is it the relay? and where is it located?

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Usually the resistor is located in the switch. If the switch is fine, then it can only be wiring or fuse. The fuse can sometimes blow leaving only one setting. Is the air con working properly, because a frind of mine had a wagon that also had this problem and he had his air con not working for some time. He got it re gassed, and the minute it worked, all the internal fans settings worked again. So could be something co dependant on power to that part of your switch. Good luck, hope it helps.

Posted on Dec 31, 2008

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