Quote:
Originally Posted by engatwork
Looks like monovalve(s) are not worth a durn. Put bypass in and it will run you out. Got three monovalves, including one recently off ebay, and none of them work .
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I just joined the forum, I've been going crazy trying to figure out my heater issues and it sounds like we are having very similar symptoms. I just got the car a few weeks ago, heat has been inconsistent until recently when it stopped all together. I replaced the torn monovalve and checked operation while it was out, seems to work just fine. Occassionally i may get a little bit of heat to come out of it, but then it goes cold and shows no signs of being warm. However, the past few days i cant even get it to blow heat at all. Pulled the glove box, vacuum flaps appear to be working.
I felt the heater hoses after the engine was hot and ACC was on full heat. Hoses on engine side were hot, hoses coming from heater core were ice cold. Next i will check to see if the heater core is flowing at all, maybe bypass the monovalve just to be sure. Anyways, please keep posting if you figure out your problem.