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Old 10-31-2003, 07:56 AM
Ken300D Ken300D is offline
Registered Diesel Burner
 
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
I have something of the opposite problem with the 82 300D. The system will start providing heat but seems to get stuck on full heat.

In the past I have found the air tube behind the glove box was disintegrated, and replaced it. The symptom of that problem is that you have to keep bumping up the temperature wheel a little bit to maintain a comfortable temperature. This is because the temperature in the dash gets warmer faster and stays warmer than the regular passenger compartment. So, when the air sensor tube is gone the system pulls air to sense from within the dash.

However, my ACC seems to vary between good temperature regulation and FULL HEAT.

Would this be more of a controller problem, or could the monovalve possibly stick OPEN?

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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