Fridge turn on switch?

Where is the refrigerator switch for a 2017 peterbelt 386.

 

The knob inside the fridge used to set the temp is also the on/off switch. At least it is in my 2018 389.

 

In the fridge.

 

Fridge in my 2015 volvo won’t turn off. It’s not reacting to the knob adjustment. Does anyone know what could happen? How to fix?

 

If anybody has the same Issue as I did, in my case the switch was iced up and didn’t physically go into off position at all (even though knob itself seemed to). I pulled the fuse for the fridge and let it defrost. Worls just fine now.

 

So I have a fridge button on my dash what is it use for because I don't have refrigerator inside my truck?

 

Stupid question but there is NO info in the owner's manual... Kenworth T680 fridge control knob: higher numbers are colder?

 

They are on my Pete fridge.