Car Problem Reports

Dodge Ram 2500 HVAC Air Flow Switching to Defrost When Accelerating

 
Dodge Ram 2500 Problem
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Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999

Average Mileage: 162,785 mi (84,000 mi - 275,000 mi)

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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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