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  #1  
Old 05-11-2009, 08:34 PM
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heat will not cut off

I have a 1992 300D 2.5 diesel the heat will not cut off. I have the climate control off but heat still comes out the vents and on the windshield?
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  #2  
Old 05-11-2009, 11:24 PM
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Faulty monovalve?

Sixto
87 300D
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  #3  
Old 05-11-2009, 11:44 PM
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Join Date: Mar 2009
Location: San Diego
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There is an easy way to check.

Remove the connector and hard-wire 12V to the mono-valve. If you do not have heat anymore then the valve is OK. CCU/wiring is at fault.

If you still have heat then mono-valve is not closing.

Good luck.
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