Self included, many people complain about this Volvo 22 trucks/tractor because the smart idol, which is supposed to keep your cabin cool at night or at your desired temperature, has a time out on the engine. In the middle of the night you will hear a consistent alarm bell until the engine powers down and disable your smart idol, which is extremely frustrating when you’re trying to sleep. But this is how you prevent that.
Now, I have not figured out how to do anything more then set the temperature at its lowest possible setting so that the truck idles for as long as it takes to reach that setting. Once the truck has reached the setting desired, it will power down as you have instructed it to do. But no alarm bell will ensue.
Then you will need to go through all this again if you want it to start over. My advice: go through this routine the first time and then make sure you set your cabin temperature requirement so that it never reaches the lowest possible setting, which is 66°F. If you have one you’ll know what I’m talking about