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
1 answer
ANSWER by on 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.

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