09 Pro Star with Cummins ISX

The best way to check them is with DLB. They are a variable resistor so it's hard to check then with a multimeter. Do you have your check A/C light on?

 

Yes, "Diamond Logic Builder" it is the software you need to diagnose International Truck A/C systems. Without that program you are just throwing a hail Mary of parts at it. You also need a proper recovery/fill AC station. With out that you can't tell what is happening with static pressures/running pressures.

 

Yes it's around $800 USD.

 

Sometimes there are faults in the system for high head pressure (high side pressure is too high) which will cause the body controller to shut that output down. It usually shows a check AC light but weird things can happen with international BC's. It might be worth going to the dealer and ask them to clear all the faults in DLB so that the outputs can activate again. Also, sometimes high clutch current faults will disable the outputs on the body controller and will only reactivate if the faults are cleared through DLB. Hope this helps.

 

Anytime... good luck!

 

u probably already checked but have you seen rawzes videos on utube, he has a video about resetting prostar ac fault, i had the same truck and same issue so that video helped me out when i was in an 09 prostar