Dodge Ram 3500 Problem Report

Dodge Ram 3500 HVAC Air Flow Switching to Defrost When Accelerating

(3 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.

Related Items:
Air will not come out of the dash or the floor only the defrost area. It does not matter if it...
My engine overheats when I use the air conditioner. The shadetree mechanic is reading a low fa...
AC has just checked out fine, blowing 47 degree air, the fan is working on all speeds but very...
when i turn the heater on it cuts out when i turn the heater off it runs fine. it acts like it...

Related Content