Sleeper ac and apu.

The coolant is most likely tied to the truck. The reason is , during winter it circulates the water to keep motor warm.
They can be set up to be self contained though with their own coolant reservoir.

I would keep it , even though your running teams I'm sure you have some down time for time to time.
Idling is detirmental to these new motors.

 

I can buy your non working Tripac APU. Let me know

 

This is a good plan. However, I suggest holding off on selling the APU. The repairs to the truck might also fix the APU.

 

There should be coolant lines with valves on them on the right side of the engine. Close them - those go to the heater cores. If the AC blows cold at that point, it's the heater control valve which needs to be diagnosed and replaced as needed.

 

But thing is ... it's a team, that truck isn't sitting in a lot with someone sleeping ever... It's always at work.
APU is pretty much useless unless you get a costly team layover.

OP, you need to get to a reputable shop and fix the factory bunk HVAC.

.

 

I figure the truck will spend at least some time sitting during loading and unloading, but I mostly agree with you.

 

Or unless the alternator goes out, because it's much cheaper to get it into a shop to have it replaced than to call for a roadside repair.

 

True. Good rule of thumb in a uptime critical application is replace alternator every 300-350k whether it needs it or not, along with tensioners and belts. Waiting for failure is always much more expensive.

 

brushless alternators on modern trucks are made to last 1m miles.