Car Problem Reports

Dodge Dakota HVAC Air Flow Switching to Defrost When Accelerating

Dodge Dakota Problem
12 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994


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.

  • Same here,no vaccuum leaks and all the check valves under the hood check fine.

    Flag This
  • air flow switches from bilevel to defrost when accelerating

    Flag This
  • Visitor, , 148,000 mi

    Air flow in vehicle keeps cycling and flips some sort of gate in the heater duct in driving gear timing seems horrible...In park or nuetral it sounds decent but still using an incredible amount of gas.

    Flag This
Ask a Question