Thank you very mych for input. I checked expansion valve and it looked good under back light so I ended up replacing o-rings since ther was spots of dye around piping. Mechanic recharged the system and now there is a bigger problem. First compressor would run for 1 second and would shut down. Mechanic said there is a clog in system since compressor puts out a lot of compression but it doesnt go anywhere so it shuts down. Then he played with his valves and got compressor to work stable. But system blows out around 78 degrees! He says that I have to change hose from dryer to condenser( he claims there is filter in that hose) and to replace expansion valve and possibly evaporator. Now Im totally confused. First recharge of system used to give out around 60 degrees. I only changed front o-rings on expansion valve nothing else. And today I were driving and AC stoped working. I restarted the car AC came back on then once I were near my home it shut down again. I checked sight glass no bubbles there. So now Im totally confused. Any body have any suggestions? Shall I change expansion valve and that hose? Thank you very much.

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1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod