I have an "extra" vacuum hose comming off the back of the intake manifold on the passenger side.
It has a few 90 deg fittings on it and it is about 2 ft long before it is broken off at mid line. I cannot figure out where it goes.
Meantime, I also have an inoperative heater box control that works on vacuum. Turn the dial and nothing changes.
Could they be related?
Can you tell me where the vacuum tank is and how the vacuum gets to the heater control?
Thanks