2009 W221 Rear Aircon Issue

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W221copea

Active Member
Joined
Dec 21, 2018
Messages
81
Location
Tyne And wear
Car
2009 W221 S320 LWB ; 2005 XC90 D5
Hi All.

Rear air con works/front also. Front hot to cold no issues but rear wants to run warm. When shut off in comand heat builds up in the centre and needs to have rear running to cool it down.

Any ideas? Heater Control Valve?

If yes - who's changed one on a W221 and how hard is it to do?

Thx
 
So - to close off my cry for help.

Rear heater control valve was the issue. Its located in the driver side front wing behind the inner liner. How easy is this to change? Piece of cake for any DIY mechanic.

Removed old valve - Tested with multi meter and found not continuity - electrical failure rather than mechanical.
Ordered replacement from Ebay for £50 rather than several hundred from MB
Fitted in less than 1 hour.
Topped up coolant
Works perfect!

Anyone with rear aircon issues - this is a DIY fix and would recommend avoiding either specialist or MB dealer if you have a socket set and a pair of pliers :)
 

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