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Hey all,

I just got my 05 GTO a few months ago and I have a question regarding the a/c. It seems like when a accelerate the air goes to the windshield vent (keeping in mind that the a/c knob is set to feet and dashboard vent) and then circulates back to the rest of the vents in the car. Is this normal with the GTO?
 

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Not really. Vacuum is what operates the diverter and the vacuum is pulled off the intake manifold off the back side. When you accelerate you lose vacuum but there is a little check valve that should hold the vacuum for that system. Check to see if it is there and if it operates correctly. It is a little white drum on a small line.
 
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