I can't recall and searching didn't answer.
1988 w/4.0. Is the heater valve normally open (no vacuum applied) or closed?
I don't get vacuum at the heater valve on any setting. Can't suck or blow through the line either regardless of setting. HVAC doors all work fine. So does CC so no apparent vac leaks. AC works fine too. Heat comes on too when full hot so I suspect the valve is normally open. But then maybe the valve is shot and simply stuck open.
1988 w/4.0. Is the heater valve normally open (no vacuum applied) or closed?
I don't get vacuum at the heater valve on any setting. Can't suck or blow through the line either regardless of setting. HVAC doors all work fine. So does CC so no apparent vac leaks. AC works fine too. Heat comes on too when full hot so I suspect the valve is normally open. But then maybe the valve is shot and simply stuck open.