1998 W210 Air conditioning troubles

[lp1raddad]

My air conditioning was serviced recently because I noticed it did not cool well, especially when the car was hot inside the vehicle. It would cool fine initially, then stop blowing cool air. A good local shop checked the compressor and system and said the system was fine , and there was no leak when they put dye in as well. I was told to look at the compressor when the cars seems to stop cooling, and upon further inspection, the compressor will stop engaging even when I still have the air conditioning on. What would cause the compressor to disengage like that????

LP