Dodge Ram Wagon B250
Report: HVAC Air Flow Switching to Defrost When Accelerating
Dodge Ram Wagon B250 Problem
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.
Visitor, 1992 Dodge Ram Wagon B250, 160,000 mi
over 50% of the time when accelerating