Tune change didn't help, when the truck first starts the compressor attempts to kick on 2 or 3 times then it quits trying. Maybe I have a bad pressure sensor?
Its not HPT.
Could be the tune, but I doubt it.
Most likely something faulty in the system.
Do you have the efan thing?
And you said it works everytime you hit the compressor button?
Then something is failing in auto mode.
Mine was doing that sometimes too before I pulled the engine.
I'm hoping that the new engine with increase power will help....LOL.
Could be that interior temperature sensor too. On the ceiling that looks like a tweeter.
I bought one of those, just haven't swapped it out yet.