Heating sends cold air to footwell

[dqh]

Heating usually fine, but on long runs, if during the drive I open the window, then it sometimes results in sending freezing cold air into the footwell. If I mess about with the direction of the vents it sometimes works, but not always. Did some searches but I can't find anything on the site. Would appreciate any assistance.

 

[whitenemesis]

Do you have Thermatronic or Thermatic? I know with the former if set to "Auto" and you open a window the system knows and alters the heat settings.

 

[dqh]

Dont know what type it is, only know that the only change it seems to do is windscreen clearing. Other changes dont seem to make much difference.

 

[whitenemesis]

Perhaps a bit more info about you car? Year, desciption of the heating controls etc..

 

[dqh]

Its a clk 55 amg (208)

 

[dqh]

Its a 208 model on a 2000 W plate with standard heating controls