The Air Conditioner is blowing out hot air!

Hello:
 
March of this year, I purchased an E320 Turbo Diesel 1998 model year.  It had one owner previously who drove it exclusively in California.  It had about 70K miles and was in pretty nice condition with very minor items which I repaired.  Since the weather didn''t turn very hot, we didn''t need the air conditioning on until recently and noticed that the passenger side vents were blowing out hot air.  Also depending on the settings, hot air also blows out toward the floor or the windshield when the air conditioning is on.
 
Is there a simple solution to this? Can I fix this myself? 
 
Also, does anyone know of a good online source for Mercedes parts?
 
Thank you.
 

is it just the passanger side vents blowin hot air? or all of them? If all of them, try charging the system.

The passenger side vents all blow hot air - top, floor, and face.  The center and driver side vents blow cool air.
 
Thanks.

duo valve.

check and replace

Flush your system and recharge it.  Go to a reliable European auto mechanic.  If he''s worth his salt, he''ll be able to tell you if the A/C freon is low... if so, the hoses should be inspected for a leak.  I had the same problem and a recharge (with a hose on the "low" side) did the trick.  My duovalve was okay but your mechanic should check it out.  Best of luck to you!  Nice car.

before you charge it or clean the duo-valve(no need to replace it in most cases.Diy cleaning on benzworld.org w210 diy section.Run
http://www.eclassbenz.com/node/27     post the 1-8 values and errors.   ohlord

Hi , i have same problem couple days ago when i bay 2003 E 320 w with 60000 mile on it. The problem is front left side blow out hot and others cold air ...they find leak on one hose and they replace,now is fine.The hoses should be inspected for a leak.