2019 Freightliner Cascadia optimized idle weirdness

I have 2020 truck and the thermostat in the sleeper controls the temperature. That's also were the sensor is. The front of truck gets hot during the day time if you interior comfortable mode is on. Because the sun is shining in. I have the 8 battery electric a/c in the sleeper and I can close the sleeper curtains and run the electric a/c and it will keep sleeper cool. If not the engine will start then and run the truck a/c. My only suggestion would be turn the temperature down even more in sleeper and that should make the engine start more.

 

If your truck has the coolant heater valves. You can close them and it should stop the coolant. If it's the front dash blowing hot air. You can reset the blend door. The blend door open and closes to mix hot and cold air. Maybe that's the problem. It still the same way on the newer trucks I believe.

 

Here they are on my 2020 truck with DD13 passenger side by back of engine kinda. I think they are optional from factory. If you don't have them you could try turning the power to cab off for 10 minutes and maybe it will rest the computers. If it a computer problem. The power cut of switch on the floor. Those are all the idea I know of.

 

Yup I never seen the new Freightliner without one but maybe they can order then without one. Have you try running engine and sleep a/c manually just to see if you get any cold air. Maybe the whole a/c system is not working or the sleeper one is not working. Make sure the yellow Park light is on. So the sleeper temperature knob is controling the temperature.

 

Yeah that's how it works the sleeper controls the fan and temperature when optimized idle is on and it's on Interior Comfort Mode and the Park light is turned on. Maybe someone else might have another idea. It suck when it hot and no a/c in sleeper