my E240 2004 leaks a small amount of refrigerant every 3-4 days (i know it by reduced cooling) and I am keep charging.

One technician in the workshop said there is no leak anywhere but expansion valve and dryer are choked and causes the gas to discharge from an automatic safety valve on the comressor....does it make sense??

If those were faulty, the system should not cool perfectly when i top up refrigerant. what say???

I have the dual zone a/c without the LCD and can't diagnose like the E320