I Own A 1997 E 420 With 169,000 Miles. AC blows cold out of passanger side vents but driver side vents blow warm air. Or whatever the out side temp is. The heater seems to work fine.
I did do the AC dignostic I found in this forum it says AC is good.
Im talking about the 2 center vents in the dash, left is warm right is ICE COLD. Any Help PLEASE!!!!!!!!!

 

You ran the diagnostics on
http://www.eclassbenz.com/node/27
post the numbers and errors.
Sounds like a stuck duovalve,you can give them a tap with the handle of a wooden screw driver,just a drum like tap to free it up.
post those values.
diy duo valve cleaning on benzworld.org w210 diy section.
ohlord

 

Thank You, ohlord!!
I did replace AC compressor and the dryer about a year ago the test says i need more refrigerant and i do hear hissing from the center vents at times. Im going to add a can today.
Here are the numbers & codes
1 28
2 20
3 20
4 15
5 20
6 70
7 13
8 53
E B1232
E B1233
E B1234
E B1235
416
419
E FF

 

Problem Fixed!!!!!!!!!!!!!!!!
Turns out it was low on freon.
After adding one can ( 12oz ) Now it's blowing cold out of both sides!!!
45 degrees in right vent 48 degrees in left vent..

 

Great,when you said all tests reported normal/i had my suspicions,center vents usually is the low r134a issue.Now you don't have to worry about tearing down the dou's .Go into error mode again and press both auto buttons at the same time and that will clear the error codes.
If it goes low again,you have a leak and you will need to detect it and fix it.
ohlord