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Waynefp's Avatar
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10-11-02, 12:08 PM   #1  

I own a 1992 GMC v6 Pick-up ..My heater speed control only works if i set it to a desired speed and get under tha hood and tap on the little switch box on the fan. I have replaced this switch box with 2 new ones and i still have to tap on it to get to start. QUESTION what else could it be??? and where can i get a heater wireing diagram so i can trace it out.???

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Joe_F's Avatar
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10-11-02, 12:37 PM   #2  
Where are you buying the relays? Have you tried an OEM GM part?

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10-11-02, 03:49 PM   #3  
Have you tapped on the blower itself?Maybe tapping the relay is transmitting vibration to the blower motor causing it to run.If so bad blower motor.

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