Sleeper ac and apu.

Unless some gomer installed the APU and did a lot of crap he shouldn't have done, the APU HVAC system (including duct work) is supposed to be completely independent of the truck's sleeper HVAC system. Or at least every one I've dealt with was.

 

Jenya the tripac can be setup to work when truck is idling, when no idling, when your(driver) are not nearby...

 

Why? The APU does nothing that the truck motor itself can't do, except turn on and off based on a thermostat.

Once the temperature gets to where you want it, adjust the vent temperature and go to sleep.

The APU is a fuel saving device. Running it when the engine is running just wastes fuel.

 

Do you know if the APU has a "shore power" outlet in the Sleeper? If so, then it might make sense to allow it to run while driving so co driver can run a microwave or what not. Otherwise running the APU while driving does not make much sense typically, as long as there is a good working inverter in the truck to power incidental things for the co driver

 

You would need a pretty long exstenion cord to use shore power while the truck was rolling down the road. Lol

 

There is only one reason to have your apu running while the truck is.
And it's if your alternator has stopped working , it can help you make it to a repair shop by keeping your batteries alive.
And yes it can be programed to run like that.
Apu' s are for climate control and keeping batteries charged.
When the truck is running co/driver can do 'whatever' using the inverter.
As far as the sleeper a.c. not working , well that could be a number of things you'll need to take it to a trust worthy shop.

 

LOL! You have bigger problems than your APU. Just saying.

 

If you bought a truck, then you can afford to get it fixed right by a shop,