2011 Workstar with DT MAXX A/C Turning off

The A/C will not come on unless you pull out fuse F1-B HVAC Control and re-insert. It will run for a few minutes then turn off. Pull out the fuse and re-insert and it fires up again. The only thing I see that is out of ordinary is the breaker for the blower fan is hot but not tripping. I did pull the freon out and it was a 1 LB over so I charged it to proper level. The engine fan is running all the time and the high side pressure never gets above 160. It is nice and cool when it is running.

 

This is another farm truck (seems like that is all I am working on lately) and it looks like a dust bowl inside the cab. It may be a stuck blend door or actuator.
Every time I hear the roar of those farm truck tires I fear for what is rolling in the yard. I have three spreaders there now.. a Terra Gator there with an injector issue (John Deere Motor), a International WorkStar with A/C issues, another International with transfer case or front axle issues.. I am ready for some simple brake jobs or heck I will even take a wheel seal job. : )

By the way.. Thanks Heavy

 

Finally got it in here. Code SPN 520465 FMI 2 HVAC Control Head multiple motor faults DM1. HVAC motor in wrong position or jammed.

I cleared the code and reset the system then code 3981 FMI 2 came up with same description.

 

Thanks Heavy

 

Were you talking about the triangle shaped actuator on the outside of cab? If so when I took the screws out of that one to pull off the mechanism that rotates the door it was no longer part of the actuator. When I reached in and removed it the door was broken off inside what was left. I installed the new actuator (hoping the A/C would stay on) but it will not. Now I also have full time heat. If this was the actuator I guess my next step is to disassemble the box and install a new door. Then see what happens. There is no filter and this thing is SUPER Dusty everywhere.