Problem Reports » HVAC Air Flow Switching to Defrost When Accelerating

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Dodge Ram Van 3500

 

Report: HVAC Air Flow Switching to Defrost When Accelerating

Dodge Ram Van 3500 Problem
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Model Years Affected: 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003

Average Mileage: 156,000 mi (133,000 mi - 179,000 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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