Hi,

I have an ACC problem. I always get cold air coming from the back vent (as if AC is continuously running) and all air flows through defrost vents regardless of setting. Is this likely to be a monovalve prob or controller prob or vacuum prob? Any comments on the most likely culprit will be much appreciated!

thanks!

edit: should have noted that otherwise the thermostatic control seems to keep temp OK - it's just that my feet and kids in the back are a tad chilly...

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1986 300SDL 175k
2003 VW Passat Wagon 58k