1992 Dodge Shadow Heater doesn't blow air when accelerating

1992 DODGE SHADOW
147,000 MILES • 4 CYL • FWD • AUTOMATIC
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PLBIEGERT
  • MEMBER
  • 5 POSTS
In my dodge shadow when I accelerate my heater doesn't blow air out of the vents. It sucks the air back in and blows it out of the vents for the defroster. What would cause this and how could we fix it?
Apr 30, 2010 at 1:00 PM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
Vacuum leak in the vacuum supply line, or vacuum reservoir. The supply line comes off the intake manifold, goes to the tank, and then into the heater control thru the firewall.
Apr 30, 2010 at 1:38 PM
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