air conditioning fan works only intermittenly on 2003 Cadillac DeVille DTS

Why does air conditioning fan work intermittenly? IT comes on when right door slams or when going across a rough railroad track

by in Las Cruces, NM on May 08, 2010
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1 answer
ANSWER by , November 05, 2010
The blower motor brushes are worn and the slamming door causes them to make contact, at least temporarily. Just been through this exact scenario.