Quote:
Originally Posted by msgaevans
With the CCU temp wheel in the full cold (past the click) position, I get twelve volts at the monovalve and cold air at the vents. 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. I repeated the adjustments above at 10 minute intervals and got consistent behavior.
It would seem that some component in the automatic temperature control feedback loop is not working and this is allowing the monovalve to remain open providing generous amounts of scorching heat.
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It seems your A/C is working now as the voltage at the monovalve is what is should be at cold/hot thumb wheel position. The only issue is that does not work in auto position ( fan switch ). It is glass half full and is good enough for me personally. I do not have access to the A/C manual, it is a separate manual, and may be other members can help.
I suspect it may be the temperature sensor inside the car is giving false reading to the CCU or the CCU itself is faulty. Try re-solder all the dry joints and see how it goes.