HVAC Air Flow Switching to Defrost When Accelerating: Dodge D150 Heating & Air Conditioning

Problem overview

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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Dodge D150 vehicles with this problem

4 model years affected

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HVAC Air Flow Switching to Defrost When Accelerating on Dodge D150

Problem overview

Dodge D150 vehicles with this problem

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