Can you tell me why My 2006 cts caddilac make a thumping noise when I turn on air conditioner. The thumping starts after I drive for awhile. It thumps a little when air is off but bad when it's on. It has 77k miles. No check engine light or any other l."
have the same problem?
Tuesday, May 1st, 2012 AT 5:45 AM