Car Problem Reports

Dodge Dakota HVAC Air Flow Switching to Defrost When Accelerating

Dodge Dakota Problem
15 Reports
Me Too

Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1999

Average Mileage: 179,500 mi (120,000 mi - 280,000 mi)


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.

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