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I had this problem once with my 2000 Malibu, It was a resistor that I needed to replace. I received instructions from some guys off the internet and fixed it myself. I don't remember the name of the site. Where are all the guys out there to answer these questions? signed a (blank) blonde.

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Q: If the number 1 and 2 settings for the heat fan of your car do not work but 3 and 4 do what could be wrong?
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