Quote:
Originally Posted by vwbuge
I think you can disconnect the wiring to the monovalve and it will go to its default position and you should have heat all the time. Someone else who knows better will chime in I'm sure.
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That's true
if the monovalve is functioning properly. But when the diaprhragm in the valve is compromised, it still won't work at higher engine speeds. In that case,the problem is a mechanical one with the valve; it's not an electrical control issue.
If you follow the advice in post #2, you are almost guaranteed to find your problem.