What is the proper procedure for clearing ECC Error codes on a 98 E300D? I have recently had the system recharged and it worked fine for a couple of weeks. Shop says refrigerant level is fine, but system no longer blows cold as it did after recharge. I would like to clear the codes and try again from a fresh start.

Here are current error codes: EB 1416,1227,1231,1234,1235,1459,1422

FWIW: I have blocked off the duo valve as the valves are broken and need replacing. I also am aware that the coolant recirculation valve is inop.

Thanks to you knowledgeable ones for any help.