Quote:
Originally Posted by Hirnbeiss
Have you ruled out the blend (diverter) flap yet? I think you could rule this out by stuffing rags in the outside fresh air vents and then driving. If you get heat then while driving, sounds like it's the blend flap allowing too much cold air in while driving.
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I have ruled this out.
a couple weeks ago -- I have a modified monovalve plunger that I actually took the plunger, seal and screen out. There is nothing left to seal the hot water out of heater core. This gives me 100% heat always. The cabin even on a 45 minute interstate run would still give full heat....I had to crack the windows bc it was too hot!!
The problem is related to the working monovalve. Even when given 12v and it is supposed to give full heat, at speeds over 60 mph or so it does not. As soon as you slow, heat returns
Are the fresh air vents between engine and windshield?