why does the blend door motor keep cycling from hot to cold

Question: why does the blend door motor keep cycling from hot to cold

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barry christianson, Mondovi, WI, March 04, 2013, 15:03

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I replaced the blend door motor on my 98 jimmy and when I plug it it and watching it before I put it in place ,it cycles back and forth nonstop while the key is on, what is the problem/

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1998 GMC Jimmy

Question: why does the blend door motor keep cycling from hot to cold

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