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2002 E430 4-Matic
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15 Posts
Discussion Starter #1
The air coming from the left side door and center vents are significantly warmer than the right when set at 72/72 Auto. I've read numerous threads and here is what I have.

Can anyone help me diagnose this problem? I'd like to understand what is going on and fix it.

2002 E430 4-Matic

Cleaned DuoValve (didn't appear to be sticking and not too dirty)

DTC Codes
B1416
B1234
B1235​

Reset all DTC codes and only B1416 remains

Sensors
After 3 Minutes
1 80
2 102
3 76
4 64
5 80
6 202
7 15
8 138​

After 5 Minutes
1 78
2 111
3 75
4 62
5 78
6 199
7 15
8 136​

Other Sensor Codes (3 Minutes)
9 30
10 2.0
11 0.5
12 4.1
20 9.1
21 42
22 00
23 32
24 13.3
40 164
41 91
42 08
43 136​

Flap Test (main observations)
Left and Right door vents were always on​

1 HI - Not Cold, Air out of Right Center outlet
2 HI - No Air out of either Center outlets
3 HI - Air out of both Left and Right Center outlets
4 HI - Air out of both Left and Right Center outlets​
 

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2007 E320 Bluetec, 2008 320ML CDI
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2,495 Posts
The left/center outputs warmer than right side is typical of low R134.

The difference between channels 3 & 4 suggests that one valve is still sticky.

Kinda warm where you are. Useful to adjust your location and other info in User CP.

At 111 degrees ambient and at idle, I'd expect #7 to be 17 to 20.

Any known A/C work on the car? Might be time to evacuate and refill.

Skippy
 

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14 Posts
What Skippy said. Most likely low on freon. Most common place to leak on w210 is evaporator or AC compressor.


Sent from my Autoguide iPhone app
 

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Registered
2002 E430 4-Matic
Joined
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15 Posts
Discussion Starter #4
The left/center outputs warmer than right side is typical of low R134.

The difference between channels 3 & 4 suggests that one valve is still sticky.

Kinda warm where you are. Useful to adjust your location and other info in User CP.

At 111 degrees ambient and at idle, I'd expect #7 to be 17 to 20.

Any known A/C work on the car? Might be time to evacuate and refill.

Skippy
Thanks for the quick response.

Front end was replaced in 2006 when I rear ended a S-Class :(

No A/C work since.

I don't have the equipment to evacuate and refill. Field trip to the dealer. Is it worth just adding some R134?

How easy is it to replace / unstick valve?
 

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Registered
2007 E320 Bluetec, 2008 320ML CDI
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2,495 Posts
I'd wager a evac and refill is in order.

Might be a slow leak, but if you've used the car for 6 years and only now noticed a problem it's a slow leak. Hopefully not the dreaded evaporator leak, but that will reveal itself as time goes by.

Your choice on the best local A/C shop. Dealer is always a good bet, but you need to be prepared for a host of other observations.
In my case, the local independent MB is not trustworthy and the dealer is. Go figure.

The duo-valve cleaning procedure is in the sticky's. Be mindful of packing the area to preclude losing non-magnetic screws.

All the best.

Skippy
 

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2002 E430 4-Matic
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15 Posts
Discussion Starter #7
A slow evaporator leak doesn't sound good. Let's hope that's not the case.

I've had mixed success at both independent MB shops. I'm planning on going to the dealer for an alignment because I'm not happy with the one from the independent shop.

I cleaned the duo-valve today. The plunger move freely in the base and in the cover. It had a brown stain that came right off. I didn't put any lube on it. Should I take it back apart and lube it?

The center electrical connector on the duo-valve was corroded. I cleaned it with contact cleaner.
 

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1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
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7,035 Posts
Your issue should be cleared up by any competent auto air con shop with a evac/refill - my compliments on chasing the duo valve (and not losing a pesky spring) frankly the "duo valve" issue is way over blown on this forum.

In my area a evac/refill with the machine runs about $80 - and they print money this time of year.

A quick can doesn't do anything to remove contaminated refrigerant.

Keep the beat!
 

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1990 Mercedes-Benz 420 SEL(RIP),1997 Mercedes-Benz E420
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1,936 Posts
I agree with vacuum and recharge, but make sure you ask them to add the dye to locate any leaks. I'd say its likely on such an old car. I had leaks from my condenser and expansion valve. May want to give those a check too...

Goodluck! I know what its like to have stress brought on by a hot car, on a hot day, with lots to do. Your E class will be much more enjoyable with working AC.
 

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88 560SL - 01 C240 - 02 W210 4matic Wagon - W212 4matic wagon
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1,090 Posts
evidently having the drivers side warmer is the norm when the refrigerant level is a bit low. In my case one of the sensors was leaking. Dealer installed new sensor and RDryer as well as new o rings for a couple of the hoses.

If you are going to keep the car I would have it looked at by a competent AC mechanic. We have used the recharge kits ... but only on old cars that we want to get a few more months out of.
 
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