Quote:
Originally Posted by msgaevans
I replaced the fuse.
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Which fuse, exactly?
Quote:
Originally Posted by msgaevans
When I adjust to full cold but automatic temp control (other side of the click), I get warm air at the vents that eventually becomes very hot. As expected, I do not have 12 volts to the monovalve when this is occurring. Moving the temp wheel back to full cold past the click gets cold air after the heat has dissipated and I have 12 volts at the monovalve.
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Voltage
to the monovalve is
not controlled by the CCU. You should have system voltage at the monovalve any time the key switch is in the "run" or "start' position. The monovalve is modulated by switching the
ground side of the circuit as controlled by the solid state temperature control module (except in "off," "max heat" and "defrost," where the ground is controlled by the pushbutton control.)
Quote:
Originally Posted by msgaevans
What should I do next?
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Plugging or clamping a heater hose should provide immediate relief.
Quote:
Originally Posted by msgaevans
What components are involved in the feedback loop that controls 12 volts to the monovalve? What are common failures?
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A bad solder joint in the CCU would deserve a top spot on the list of probable suspects.