My 1994 gmc sierra does not blow any air through the vents. the buttons are working but no air is comming out? Any thoughts on where to start?

Asked by Dec 09, 2013 at 10:52 AM about the 1994 GMC Sierra 2500 2 Dr K2500 SL 4WD Standard Cab LB

Question type: Maintenance & Repair

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19,485

its not diverting under dash, los of vacuum from engine is common, a small 1/8 line coming threw firewall

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