My 95 full size GMC conversion van that has a rear heater diverter valve.
It's about a 2' long pipe with a three way, vacuum operated actuator on
the top. It went bad several years ago, so I bypassed the rear heat.
Meanwhile, I tried for a long time to find a replacement. The dealer says
it's not factory part (it looks very GM), and the upfitter says it's not
theirs. In fact, the conversion upfitter (Gladiator, currently out of
business) sent me one of theirs, which is a typical plastic, vacuum
operated valve you'd expect from aftermarket. I sure would like to find
the correct replacement. Anyone with a van of that era that has
experience the same problem? Any ideas?