Dodge Ram Van B250 Problem Report

Dodge Ram Van B250 HVAC Air Flow Switching to Defrost When Accelerating

(17 reports)

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.

This problem has existed since new -
same thing -
I wish someone would post how to fix it. It seems to be a wide complaint. Seems someone from Dodge or any good mechanic would post the cure. -
ac blows through defrost vent when i step on the gas -
ac switches to defrost when accelerating -
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