Dodge Ram Van B150 Problems

HVAC Air Flow Switching to Defrost When Accelerating on Dodge Ram Van B150

Problem Description and Possible Solution

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.

(6 people reported this problem)

Dodge Ram Van B150 Vehicles With This Problem

RepairPal Verified
Average mileage: 136,014 (136,014–136,014)
5 model years affected: 1990, 1991, 1992, 1993, more1994
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Brake problem? Or maybe a faulty head gasket cylinder?
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