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Old 06-06-2005, 03:02 PM
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Join Date: Jun 2005
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1987 MB 300 DT a/c issue

My 1987 300DT a/c was working great. Icy cold air, daughter drove car and next day a/c only blows hot air. Any idea of the problem?

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Old 06-06-2005, 03:42 PM
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Join Date: Jan 2001
Location: California
Posts: 2,068
Does the AC blow cold when the engine isn't warmed up, and after it's warmed up the hot air "overpowers" the cold? If so, the auxiliary water pump is shot. It's located under the windshield washer bottle. I had this exact problem, and a good used auxiliary water pump solved it...
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Old 06-06-2005, 04:37 PM
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Join Date: Jun 2005
Posts: 2

No, it does not start out cold just all hot air. I am wondering if somehow the thermometer is stuck on hot?
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