Quote:
Originally Posted by Craig
We posted at the same time, but shouldn't the monovalve cycle correctly when he jumpers 12V directly to it?
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Yes. The monovalve operates on system voltage. When the CCU is in the "Off" mode, it provides a "hard wired" ground path so that the monovalve remains closed. In the "Defrost" mode, the ground path is broken so that the monovalve remains fully open. In the other three modes, the ground path (and therefore the monovalve) is controlled by the Electronic Unit for Temperature Control, a solid state device separate from the CCU.