HVAC Air Flow Switching to Defrost When Accelerating: Dodge B250 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.

22 people reported this problem

8 comments

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Dodge B250 vehicles with this problem

5 model years affected

Average mileage: 137,801 miles

(75,000 - 251,000)

Repairs related to this problem

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HVAC Air Flow Switching to Defrost When Accelerating on Dodge B250

Problem overview

Dodge B250 vehicles with this problem

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