The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. There is also a revised vacuum check valve available to address this concern.
HVAC Air Flow Switching to Defrost When Acceleratingon Dodge Dakota
Average mileage : 157,142 (100,000–280,000)
18 people reported this problem
6 people shared problem details
During acceleration, the HVAC switches from max cool to defroster mode. Not found source of problem.
1999 Dodge Dakota120,000Visitor
No solution yet. Switches to defrost vents under acceleration. Suspected vacuum issue.
1990 Dodge DakotaVisitor
Same here,no vaccuum leaks and all the check valves under the hood check fine.
1992 Dodge DakotaVisitor
air flow switches from bilevel to defrost when accelerating
1990 Dodge Dakota148,000Visitor
Air flow in vehicle keeps cycling and flips some sort of gate in the heater duct system.....plus in driving gear timing seems horrible...In park or nuetral it sounds decent but still using an incredible amount of gas.
run good when cold
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My heater is stuck on defrost...when I change it to feet or vent option it still only blows on...