if you want, just for kicks pull it apart and check to make sure the fan is in place tightly. also, i know this sounds really unlikely, but had a fuse burn out just enough that my 2nd and 3rd setting would work and the others weren't getting enough voltage through to do anything. it was a big surprise to me because i changed the fuse just for kicks and it really fixed the problem.
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2000 Chevrolet Malibu LS
2000 Oldsmobile Alero GL (sold)
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