The flaps which determine where the air blows out are vacume operated. Check your vacume source.
SOURCE: no air flow to dash vents and feet vents
99% of the time when they do that it is the control head. that is the thing you adjust all your temp settings on. have to purchase from dealer. have last eight digits of vin # when ordering.
SOURCE: 1999 Chevy Express Van Side Door will not open
You need to replace the handle itself. The inside of the handle where the metal cable fitting attaches causes too much strain on the plastic and the molded groove breaks. Ford has the same problem. I don't know why these car man. dont just go back to all metal exterior handles. If you have time you can probably fix it with epoxy and washers, but the fastest way is to get one aftermarket or from a junkyard. Hope this answers your question.
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SOURCE: on my 1995 chevy blazer s-10 my face vents are not blowing air
the vacuum on the rear of the engine that goes to the vacuum ball mounted n the hood may be disconnected
SOURCE: 1996 chevy blazer my air on heater will not blow
the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up
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