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  #1  
Old 06-26-2007, 09:41 AM
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AC Problem

AC works fine most of time. Every now and then the tach needle drops back to 0 (usually after a automatic transmission shift under fairly hard acceleration), when this happens the AC quits blowing cold air. You can pull over and shut the engine off...wait a few minutes and restart and it usually begins working again. Any ideas? Sorry about that...1985 300 DT


Last edited by jimbob; 06-27-2007 at 01:24 PM.
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Old 06-26-2007, 10:31 AM
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year and model? [I just sold a 78 240D]
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Old 06-26-2007, 10:36 AM
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mmmmmm Diesel...
 
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Need year and model. Some newer ones rely on the input from the tach. A zero RPM signal will shut down some a/c systems and the 0 RPM indicates engine shutdown.

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