I have small R12 freon leak. I went to shop to find leak. They said that they have to recharge the system and put dye in system and when A/C will blow warm to come back and they will find leak. System was recharged. But when I sat in traffic I felt not that cool inside the cabin. Once I resumed cruising speed it became pretty cool inside cabin again. Also when I drove in stop and go city traffic I also felt kind of warm. Shop says its normal but I just serviced A/C on my other car and it blows cold all the time. Is there other components I should tell them to check? Like expansion valve or anything else? Should I replace receiver/drier maybe? Shop says compressor is good and ans come on and car does not go above 100 degrees on hottest days and recylce air valve is working fine. Any ideas?
Thank you
Victor

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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