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In my 86 Deville, the vents dont blow the air out. I can feel heat or cold air when the a/c is on. Also when i switch from the auto to defrost, i can hear the flaps switching, but the air isnt being blown out. It is mainly a problem when i need to defrost the windshield. I dont know if it's a fan that is broken or a switch. A friend of mine said it may be a vacum line? Any ideas why air isnt blowing out?
 

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Is the fan for the HVAC running?? Can you hear a fan start up and the sounds of air moving when you switch the HVAC system from OFF to AUTO or DEFROST??
 

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Then your problem is a dead fan or control module. I think on your car it may be on top of the HVAC box on the firewall.
 
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