most likely a vacuum leak or faulty control on the dash
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Probably a faulty blend door actuator. Remove the glove box to gain access to the actuator. Replace the actuator with a new one.
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Cannot seem to get the air to flow throught the vents top or bottom. I have replaced the faulty blend door actuator loctaed on the side of the unit, but still no air or anything. Question: some one said that the openings have to be reset in order for the actuator to work, is this true? I do remember hearing a mechanic say that the way the original actuator came out is how the new actuator is supposed to go in. Please advice. Troy
I believe it is located behind the glove compartment. Drop out the glove compartment box and you will see the blend door actuator.
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Remove the dash assembly to gain access to the blend door actuator.
Probibly your blend door motor is stripped out. Remove motor and check door operation manually