4Runner AC Control Unit Defect

I had a similar issue with my 4Runner. Was the error related to the coolant temperature? Also, have you checked for any coolant leaks around the heat exchanger or the temperature sensor itself?

Coolant level is fine. The error points specifically to the temp sensor on the heat exchanger. It's not reading correctly, or at all. You had the same sensor issue?

Yes, the same sensor. I'd recommend taking it to a workshop, they can run proper diagnostics to be sure. It is most likely the air conditioning control unit.

Thanks. Looks like that is the way to go. Workshop confirmed the AC control unit is defective. Quoted 980€ for the repair.