Dodge Ram 2500 Problem Report
Dodge Ram 2500 HVAC Air Flow Switching to Defrost When Accelerating
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.
When accelerating with the vents on it switches to defrost until I quit accelerating. - Visitor
switches to defrost under acceleration - Visitor
Air flow switches to defrost when accelerating or pulling up hill. Have not found a fix as of now - ges1943
Took to dealership and they could not find problem and just recharged the air conditioning.
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