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Happy Friday! This summer (my first with this car) has shown an odd idiosyncrasy with the a/c controls. Specifically, when pulling a moderate load at low rpms (auto tranny), the a/c flapper valve flips over from the dash to the defrost vents. I know this is caused by low manifold vacuum, but, shouldn't there be a check valve in the system that attempts to hold vacuum in the system during those brief excursions? Just as soon as either the throttle is lifted slightly, or the stubborn tranny decides to down-shift, everything's back to normal. A few assumptions on my part (yes, yes; I know...) 1) There is a faulty check valve somewhere between the engine and the heater controls, B) There is a leak between the hypothetical check valve and heater controls, 4) There is a leak in the flapper motor/diaphragm This could all be resolved if I knew two things; is there a check valve, and, if so, where is it? Anyone? Beuller? I can't seem to find a proper all-car vacuum system diagram for this critter. Thanks for your help, Nathan
