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Discussion Starter #1
In order to keep this short and to the point. I have a 84 300d heater works great between 0-30mph. Does not blow very hot at high speeds. The gauge reads full temp the whole time. It is about 35-40 outside temp.
Heater seems to work best when slow or sitting still. Is that a thermostat problem? Any suggestions? Thanks
 

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Discussion Starter #4
85-90 C is what my gauge says. OOH, thanks for the info on the monovalve, that sound like the culprit.
 

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1984 300D 375,000 miles 1996 e300d 266,000 miles 1983 300SD 174,000 miles Ascot Grey
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+1 on the monovalve. Happened with both of my w123's just like you described. Thirty-something dollars at autohausaz, if i remember right, quick and easy.
 
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