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Heater fan only blows on high on 1998 gmc sonama

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Hi first thing to do is replace the" BLOWER MOTOR RESISTOR " this controls the power and speed to the blower. And on trucks they are easy to get to to replace. And they are pretty cheap. At the part store they can give you a print out of location it is on the firewall or inside on the a/c heat box it is only 1 plug and 2 screws.

Posted on May 26, 2009


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