6.7L Cummins Forum

Hoping someone has some information on problems with the floor setting on the heater control panel. My 7.5 seems to stay in the defrost setting when choosing the floor setting. If I keep tinkering with the control knob eventually the floor vent will come to life. Thinking about removing the panel and checking for voltage for floor blend door actuator. Any advice is welcome. Thanks.

Sounds like a problem with the blend door actuator or the door pivot.

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2007 Ram 2500 QC 4x4 SLT TRX4-Offroad 6.7L Automatic. '08 Jeep WK 3.0L diesel-wife's DD.
1998 Jeep ZJ 4.0L Automatic Selectrac-project for our son. '98 Jeep XJ-my wife's former DD.
1965 Dodge Polara 880 Convertible 383 Automatic.

Yup. Got a similar problem here where there is no air flow to the floor and I've got a sound like a "blend" door (or recirc door) is flopping around. A little Web research indicates that 2002 thru 2008 models have a problem with the door pivot shaft breaks under duress due to the strength of the servo motors. Further discovered that HeaterTreater™ (note: .net not .com) has an improved blend/recirc door solution which they claim can be replaced without removing the air box.

Has anyone got any experience with:
1) Heatertreater
2) Actually performing the repair "in-frame"

Regards...Ed

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2008 6.7l, 6 Speed Manual, Std Cab Long Box, K&N Air Filter, Warn 9.5TI Winch, Firestone Air Bags, Raycor Fuel Filter.
Full time IT Network Geek, Part Time Wilderness Guide. (try anything once..twice if you like it)
VA7ECM

you may have broken doors in the plenum or a bad servo.i dont know for shur if 7.5 still have these problems like my 04 has.