2020 Peterbilt 579 w/ a Paccar Engine
The air conditioner randomly decides to not work when starting the truck up.
I have to shut the truck off, turn off all lights, external lights and wait for the truck to completely shut off (except the eld)
By shut off, the brain of the engine has to shut off.
Then I can restart the truck, if it does not blow cold air, I have to repeat the above.
I repeat this multiple times sometimes until the air finnally works again.
Then as long as I don't shut the truck off the air works without issues, but if I shut it off, the issue has a chance of arising again.
For example, my co driver (wife) shut off the truck twice today with no issue, on the 3rd time she fueled, when we restarted the truck it didn't have air conditioning, I had to sit there and do the above method 5 times in the fuel Isle since I couldn't park anywhere else due to it being full.
Any idea what could cause this, and if there is a way to fix it, this is our last month with this truck and company and I really don't want to have to put it in the shop and spend and entire week waiting on it