A/C issues. how to pull codes on W211
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 73
Likes: 2
2003 E320
A/C issues. how to pull codes on W211
Hello,
I've noticed that over the last few weeks that although my A/C still blows cold air, it was slowly warming up. Yesterday morning on my way to work the air seemed okay. A few hours later when I got into the car, the air was just blowing hot. When I got home and hooked up the refrigerant, the pressure read the the lowest setting on the gauge. So I filled it with about a half a can of freon and now the air blows colder in the right vent than the left.
1. Is that a sign that I need to still add more freon?
2. Is there a way in a W211 to read the A/C codes? I've seen how to do it with W210's, but that ac panel is partially digital, where mine isn't.
Thanks..
I've noticed that over the last few weeks that although my A/C still blows cold air, it was slowly warming up. Yesterday morning on my way to work the air seemed okay. A few hours later when I got into the car, the air was just blowing hot. When I got home and hooked up the refrigerant, the pressure read the the lowest setting on the gauge. So I filled it with about a half a can of freon and now the air blows colder in the right vent than the left.
1. Is that a sign that I need to still add more freon?
2. Is there a way in a W211 to read the A/C codes? I've seen how to do it with W210's, but that ac panel is partially digital, where mine isn't.
Thanks..
MBWorld Fanatic!
Joined: Jan 2009
Posts: 9,224
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Don't listen to advice on W211 from W210 driver 
W211 have several types of climatronics and some of them allow for reading the sensors just like W210 did.
Our first W211 had 4zone climatronic with such feature.
Next w211 come with LCD display, but no Rest button.
I bought 4-zone climatronic on ebay for about $50 and now can read sensors on it as well.
It is way much "cooler" display anyway and it is plug&play.
About 20 minutes to replace if you have never done it before.
W211 have several types of climatronics and some of them allow for reading the sensors just like W210 did.
Our first W211 had 4zone climatronic with such feature.
Next w211 come with LCD display, but no Rest button.
I bought 4-zone climatronic on ebay for about $50 and now can read sensors on it as well.
It is way much "cooler" display anyway and it is plug&play.
About 20 minutes to replace if you have never done it before.
Member
Joined: Jun 2016
Posts: 161
Likes: 33
From: Orlando, Florida
2005 E320 CDI (SOLD); 2008 ML320 CDI 4MATIC
A/C warmer on left than right indicates low on R-134A but best to keep track of how much is added as 950g is capacity for dual zone & too much will keep A/C from cooling ice cold. I used a small digital scale to add 50g increments until both sides blew 40 F air temp. I used R134A w/ UV dye & traced leakage to presto-valves for high & low pressure manifold connections. I replaced the plastic/rubber caps on these connections & used teflon tape to make sure they seal as best I could. A/C blows cooler than a polar bear's toenails for time being. 
