2015 Kenworth T680 Temperature Control

Are you certain that you changed the temp door actuator? There are 5 total actuators in the dash and they are all the same part#. The panel and temperature doors can also strip or break where they attach to the actuators.

 

Goodysnap is on the money. It may be wise to get it properly diagnosed at a dealer using ESA. Replacing a blend door is a labor intensive job in a T680 or a PB579. You can possibly try resetting the CECU, but if the doors dont calibrate you have an issue. Are you sure you have good coolant flow in/out of core?, just wondering. But I would just keep throwing parts at it

 

I meant to say, I would not just keep throwing parts at it(oops)

 

I have a problem with a blend door Defrost/Dash vents, it stays on vents. I tested the voltage at the actuator plug and eliminated the controls. removed the actuator and tested it with a 9v battery as shown on utube and it was bad. replaced the actuator only to find that the blend door shaft was stripped out. I have tried wrapping teflon tape around the shaft, but the female side is to stripped out. can this be glued and then calibrated?

 

There is a update to the HVAC software that is supposed to help with that issue of blend door being held to tightly. Might wanna get the update. It is TIB 01-073.

 

The doors are common to break. Replace temp and panel doors and actuators. Dash removal is required.

 

Can you please tell b where that dash vent actuator is located?I am having a issue with defrost dash vent.