This is my first MB! I have been a service tech. for many years but have no experience with MB. I have the auto climate controll
on this car. It does not matter where I put the dial the valve for the hot water does not open. Can someone direct me in the right
area. I pulled the blower out and lubed it and it runs like a top now. Great forum and thanks. dave.

 

the heat valve is an electromagnetic "mono valve" that mixes water based on an electric charge. look near battery?[firewall passenger side] for the valve with heater hoses to it.disassemble and clean,if nothing replace