Quote:
Originally Posted by loneranger
Apparently there is something I'm still missing here. Am I correct that with no current the valve is open (max heat). Why doesn't this valve work? Does the valve get stuck in the hole or does the negative pressure created by water flow suck it shut? Trying to see how to fix this so the valve works correctly. Is this company a division of URO? It is hard enough figuring how to fix these cars when the parts work!
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Yes, no current, valve is held open (by spring tension)= max heat. If you had a leak in the large diameter diaphragm, corrosion that developed could cause the solenoid to hang. If you are rebuilding it, you have to take it to bits and clean it so the iron core plunger slides freely in the coil. There is also a float valve that could jam due to debris. If you shake the monovalve, you should hear it rattle. If you blow into the bottom port (with monovalve in orientation as mounted in car), you should hear the float rise up and flow stops.
I find it hard to believe a weak spring can stop flow due to water current. Until I inspect one that actually does that, I am not buying it. I suspect it is due to other causes.