Not to mess up a good idea, but if the A/C system is cooling and working fine, do not work on it for any reason!!!! Mercedes A/C systems are complex and the early 124's do not convert that well to 134 if you do not have an updated condeser. IF it ain't broke, don't fix it!! If it does fail, then do the work to repair the leak and convert. Good luck.
ASE CERTIFIED MASTER AUTO TECHNICIAN
SHOP MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM