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Heat blend door sounds like a big deal... but, it also sounds like it might be the problem. Do you know if the door can be replaced without removing the entire box assy containing the heater core & A/C evaporator? Also, do you know where the vacuum line that drives the door originates...

arghh the flap you mentioned is working OK - if you release the glove comparment so it flops down, and look in/under the dash, you can see it operate. also, what converts the temp knob setting to the vacuum signal that goes to the heater valve? i can see the back of the control head, and it...

It's not the heater valve.... I checked the heater valve - it moves in and out (driven by vacuum) on its own when you change the outlet selector from "off" to floor, floor/defrost, defrost, etc. Also, both the inlet and outlet hoses going into the firewall are hot, so it looks like hot coolant...

Testing the heater valve... Thanks for the quick response..... Sounds like a pretty good plan. A couple of questions though: Where is the heater valve? (I think I saw in another post that it's on the firewall, on the driver's side, and can be identified as the valve that has three...

1997 4dr AWD Engines gets up to temp just fine, but (all of a sudden) can no longer get heated air out of any blower vents, no matter which setting the selector switch is set to. Fan works fine on all settings, and A/C works fine too. I bought a Chilton's manual, which is pretty...