Aircon problem with hot/cold air

[uhayat]

Hi all,
I am facing an issue with the air coming out of the vents. The left vents are fine and blow cold air while the right vents are not. They start with blowing really hot air then cool down but not cold enough. Is there a duo valve in a w211? Where is it? flaps stuck? Please help.
My car has the regular aircon panel and not the four way digital one. Star machine does not show any codes in aircon.
Usman

 

[horsesuitedfool]

I have exactly the same problem with my W203 C270, cold air from the left vents and warm air from the right vents. Very strange and as yet i dont know what is causing it.......Anyone else have any suggestions?? I tried resetting the flaps on the control unit but doesnt seem to have done a great deal.....

 

[horsesuitedfool]

I guess its just mine and yours thats ever had this puzzling issue....I might put mine into MB Dealer to be resolved....Will advise if i find out problem.

 

[uhayat]

thanks - last resort is the dealer. I hope someone replies.

 

[Diesel Benz]

Hi all,
I am facing an issue with the air coming out of the vents. The left vents are fine and blow cold air while the right vents are not. They start with blowing really hot air then cool down but not cold enough. Is there a duo valve in a w211? Where is it? flaps stuck? Please help.
My car has the regular aircon panel and not the four way digital one. Star machine does not show any codes in aircon.
Usman

No duo-valve in the 211. It has a heat exchanger shut-off motor that has taken the task of duo-valves, also in the sense that this tends to fail (early ones I guess mostly).

DIY: Installing a new Changeover/Heater Control Valve - MBWorld.org Forums

Cold at one side is likely from refrigerant fill level being too low.

 

[BlackC55]

I guess its just mine and yours thats ever had this puzzling issue....I might put mine into MB Dealer to be resolved....Will advise if i find out problem.

It may be low AC gas or the heater flap motors need normalizing. 5 min job with a Star.

 

[Diesel Benz]

It may be low AC gas or the heater flap motors need normalizing. 5 min job with a Star.

There was a thread explaining how flaps could be normalised from the HVAC control buttons, pressing two buttons at the same time. But this advice was for a W203, is there anything similar for the W211? I think this remained ambiguous from the old thread.

 

[uhayat]

SOLVED - It was indeed low on refrigerent.