No heat in 2015 Peterbilt 579

Check them yourself. Only takes a couple minutes to take a quick look.

normally when you only get heat on the high setting it’s a plugged up filter or the core itself is clogged up

 

Temp door is probably broken. Even tho the actuator moves the door can be broken or stripped inside.

 

If this is the case, who wants to be the one to break the bad news on the labor cost for replacing the $35 temp. door??

 

About 6 to 12 hours iirc from when it happened in a company truck.

 

Gorilla tape on the fresh air intake vent will solve it.
It's hidden behind my air cleaner out of view.
If a want fresh air I can lower the window .

 

I was told 9 hours labor ....

 

The actuators are all the same part number all 5 so u can swap.

Date code 365/15 and older had issues with shorting internally.
Also check for wiring rub points at RR corner of radio case. Grey wires.