Quote:
Originally Posted by steamboatsykes
Interesting, then some force pulls the plunger out with the coil off to stop the flow of coolant.
I can confirm if I turn the climate control to max cold, I have no heat at any speed.
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Not quite. With no power, a spring inside (under the diaphragm) pulls the plunger upwards to allow flow.
There is also a one way valve in the "bowl" right above the lower hose which prevents back flow. It is a free floating plastic ball and moves up/down about 1/2". If you take the monovalve off and shake it, you should hear it rattle. If you don't hear a rattle or if the rattle is very faint, that ball may be stuck or that bowl area is clogged and can impede coolant flow (even if the electromagnet plunger is working). If that's the case, unclogging it and cleaning it with a CLR solution may restore its functionality.