More a/c problems
 

My A/C is not functioning properly. The fan and compressor seem to work only at certain speeds or rpms. At stationary, no fan noise or cooling can be heard or felt. After I have accelerated a distance, it comes on and when I release the accel. it goes off and comes on again when I step on it. Funny or normal???:confused: :confused: The windscreen takes ages to clear so the system is not dehumidifying quickly enough and can be dangerous. Can't wait to move off for too long. At the most 3 minutes from engine start, more and it will seem like somethings very wrong. The heater function is working. A/C is not very cold, not enough anyway. What can be wrong with it besides the drier tank glass window at the top having a crack in the glass right across, but with no moisture leak apparent.

1994 Euro C180 Elegance auto.
194,000kms.
Otherwise running fine.

It sounds like speed related problem, check following:

RPM/speed sensor on the back of Compressor.
Check your A/C belt, it might be slipping.
Low freon can cause this situation also, since at low pressure compressor will cut.

Hope this helps