Hi,


I'm borrowing an '85 w123, seems to have a few climate problems.


When air blows out, it only blows defrost. When anything else is selected it either doesn't come out or goes to defrost. I can hear the blower motor working, just no air.


When cruising down the freeway, almost no air comes out. As soon as I reduce speed on an off-ramp, suddenly all the hot air blasts out-again, only to defrost.


I have a w126 300SD parts car with a good climate control system that worked when I parked it 6 months ago. Are most of those parts interchangeable?

Thanks!