when i switch the condaition it is cold put the problem in back air coming hot on 2004 Mercedes-Benz E500

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air in back hot
(1) Answer
Take your MB to a good repair shop that specializes in Benz, have them check for any diagnostic trouble codes, and have them look at the technical service bulletin listed below.

Bulletin# P-B-83.20/72
Rear A/C Intermittently Blows Warm Air in Cooling Mode or No Warm Air in Heating Mode