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Sounds like the diverter door is bound up causing the motor to bog down under load. You'll need a manual for that job. It's a pain in the rear to get to.
Dear Aaron,
Your heater and air conditioner assemblies are partly vacuum actuated.
The parts underneath the dash are also largely plastic.
Many, if not most of the time, either there is a vacuum leak ( that you
probably cannot hear) or a plastic part that is sticking or has broken. Those parts like that are usually inside the housing & ductwork under the dashboard on the right side also under the glove box.
God bless your efforts.
Hey! Ahhh this is always fun. Generally what I have found to be the problem here is this: In your heater/AC box is the heater core. Usually in older models there is a twin coil to help the defoster heat up faster. This box will accumulate leaves trash and other things. when teh defroster or heater is on the coils come on heating up and start to smolder the leaves and stuff.
I have seen this on GM vehicles before. If you take the temp selector and change it to the middle or to cool it will not let warm air go through the defrost vent. The hot air coming out of the defrost vent is because the heater core has warm coolant going through it- and the user generally has warm selected on the temperature setting.
Hey mad40bx that will be your heater core,,just pick up a new one and grab a haynes or chilton manual for your truck if you are not familiar with the procedure its not that bad, if you dont need it fixed immediately take the 2 hoses off from the firewall (One is supply and one return) and couple them together this will bypass the heater core until you are ready to fix it, good luck
Hi Emmisionwiz,
Was able to repair problem. There is a position motor under the tape deck that would not turn...removed and cleaned...working good now.
Do you have automatic climate control?
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