2012 Peterbilt defrost work only

This is what your HVAC system looks like. #4 is the mode motor that changes your modes from floor, vent, defrost, etc. Kind of a bear to get mode actuator. Remove center dash panel and its down there. Unbolt motor and see if drum is stuck or motor responds to commands. I have seen them bind and can get to work by unbolting them and re-bolting. Also fished out a couple pens! The P/N of motor supercedes to SR2000017. Let us know what you find.

 

Sunflower seeds jammed up that fell though?
Good to hear its working again.
In pickups its usually 22 shells that fall into the defrost vents. They all rattle out eventually

 

I have same problem. Wont switch to defrost on my 386. Anyone have a pic as to where that actuator is. Last 6 of vin are 206339. Thanks in advance

 

2017 peterbilt PB330 Cummins engine HM319044 a/c stuck in defrost mode wont switch modes changed the mode select actuator it has the hot /code actuator and another actuator I think is the recirculation air door now I can see them turning but it doesn't seem to be moving the rod to switch it to vent

 

I know this is an old post, but it helped me out. I have a 2011 Peterbilt 386 and the defrost did not work. Air coming out of face vents and floor vents and switching back and forth no problem, not no air out the defroster. Out of frustration after I had the dash apart and the covers off the bottom, I called the Peterbilt dealer and the helpful guy there told me where to look. It's just like the pdf's in the first post, you get to it from behind the gauges. Also have to take out the radio and heater controls. I had to take out the duct going up to the dash defrost vents. A load seal tag had fallen down defrost vent and kept the drum from turning all the way to defrost. Pulled it out and all worked fine. Just a side note, the controls started working funny, like when the fan was off you could see the controls were turning the drum like they should. When fan was turned on it went to defrost mode and stayed there. What happened was one of the dash panels was pushing the trailer brake lever down and drained my batteries. Jumped the truck and worked fine.