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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
air in back hot
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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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
SUBJECT:
Rear A/C Intermittently Blows Warm Air in Cooling Mode or No Warm Air in Heating Mode
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