Sounds like a bad monovalve. I know when I was messing around with my climate control and disconnected the monovalve connector, all I could get out of the vents was hot air.
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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608
Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.
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