2002 Cadillac DeVille Q&A

2002 Cadillac DeVille Question: My climate control - location and fix

when i turn my climate control on it makes a clicking sound for maybe like 30 seconds, goes away and then starts pushing air. It only blows air from the defrost and floor. every once in a while it will work properly but not often. Any thoughts to the problem, what part do I need and how do I access it? -
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