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

air in back hot

Asked by for the 2004 Mercedes-Benz E500
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