Rear Air Con

ccredlaw

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Jul 9, 2013
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Reading
Your Mercedes
2004 E320 CDI Saloon
On my 2004 E320 CDI Saloon, the rear air conditioning unit has started to pump out hot air after a few miles. The front is fine and pushes out cool air as normal. All four temp thermostats are set the same ie 20 degrees C for both front and both rear.
Air con was checked a couple of weeks ago during a normal service.

Any pointers as to what the problem is would be most welcome.
 

Oarsman

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Mar 16, 2010
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Norfolk
Your Mercedes
W221 S350L CDI Bluetec, Range Rover Vogue SE 4.4 TDI, 1963 Triumph TR4
It sounds like the duovalve is stuck in the open position, allowing a constant flow of hot water through the rear heater matrix.
 


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