W211 Air-Con Intermittent Fault

[Gordon R]

Can anyone help please?. My E320 Cdi Sept 2003 appears to have an intermittent fault with the Aircon. It has the Luxury climate option but some days even when set to low, the rear passenger blowers put out hot air. Whatever the settings it makes no difference. Next time I start and drive the car all seems OK again. The only thing I recall is that when the car was in warranty the Aircon would not get hot. Thanks in advance

 

[BlackC55]

The duo valve under the brake fluid resevoir maybe the cause.

Also get the a/c motors normalized by a star. (MB diagnostic)

 

[Ellsy Tanners]

I think i read a similar thread to this a few weeks back, have you checked the archives??

 

[Gordon R]

Many thanks for the prompt assistance. I Will check this out. Kind regards Gordon R

 

[BlackC55]

Its actually called the heater control valve.

 

[jberks]

This was a very common problem on the early 211s with this setup. I remember hearing a lot of reports in the early days. However, I was under the impression that it was a software glitch?