Manuals for Maintenance and Repair in English (and some more in German)
33 Manuals at Autoschrauber.de/en
While the vehicle heater only pumps the cooling water through hoses and pipes, the air conditioning compressor, condenser and evaporator take care of a constant phase change of the air conditioning gas. Whether this is R134a or R1234yf is irrelevant. All content on this topic in this category.
If the air conditioning system is not working, there is often a lack of refrigerant. Leak detection is possible with forming gas, UV-Lorke or a little spit.
Snorkel out the entire air conditioning system and reseal it? The cable for the magnetic switch could also be faulty…
