[W126 Coupe] W140 Coupe AC Problem

[Flodur2 at aol.com]

My ’95  W140 is having an AC problem. The heater works fine, all winter, on 
both  (driver and passenger) sides. But now, when it calls for AC, it works 
fine for  about 20 minutes of driving and then the driver’s side (only) goes to 
full heat  while the passenger’s side stays on cooling. After a while the heat 
shuts off  for a little bit but after a few minutes goes on heating again. Any 
idea as to  where to look for the problem? Is it an electronics control 
problem, a sensor  problem, defective control flaps or actuators? The outcome on 
troubleshooting a  similar problem would be appreciated. (Taking the dash apart 
is a  bear.) 
Rudy  Boentgen 
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