I installed a new A.C. compressor and drier on my 99 E320. The ac is now ice cold, but there are times when the compressor will suddenly stop blowing cold air by cuttimg off. I can get it to immediately come back on by pressing the "EC button" and then back off. Thereafter, the compressor will begin blowing cold again. This happpens even the setting is on "low". The fan adjusts correctly to the temperature inside the cabin.

Any ideas what is causing the compressor to cut off but back on immediately by pressing the EC button on/off?

Thanks!

Richard