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There are repair manuals on CD on Ebay. I bought one, but couldn't really make heads or tails of it. I have an 89 300SEL that didn't heat or cool. I recharged the AC and got it working (after tightening a loose hose), and got the heat to work after replacing the Mono Valve diaphragm. The AC work cost $30 and the valve repair kit was $65. I got it from PerformanceProducts.com. I hope this answers your question.

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16y ago

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