update on my heater valve vacuum line problem. i fixed it:
while we were enroute to elk meadows campground near trout lake, wa. to attend the fort Vancouver chapter of the good sam club camp-out, we stopped at camping world in troutdale, or.
they had a 2000 winne adventurer on their lot
and i opened the dash on it and found where my green vacuum line is supposed to go. there is a blue vacuum line attached to the control module that has a Y connection about 5'' below the module. the green line connects there.
the original problem was that there was always warm air coming out of the dash air vents, with the controller set on full cold, even with the dash air on.
i purchased a generic heater control valve for gm products from schucks auto supply for <$10. (factory air part # 74612).
the vacuum fitting on the new valve is facing 180 degrees from the old one. this made the vacuum line pretty tight.
the first time that i lifted the dash up, the other end of the green line became disconnected.
these lines are in a bundle with wires. the vacuum lines even look like wires. i couldn't figure out where the end of the green line was supposed to go. i spliced in a 6'' piece of 7/64'' vacuum line and connected it to the Y fitting.
all is well now. i get cold air out of the dash vents when called for by the temp selector.