a/c blowing cold on passenger side only - Mercedes-Benz Forum
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post #1 of 29 (permalink) Old 05-19-2019, 10:38 AM Thread Starter
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Vehicle: 1999 E320
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a/c blowing cold on passenger side only

I have an 1999 E320 with about 64K miles.
a/c is cold on the passenger side only.

I would appreciate your help.

I couldn't find what "normal" values are.
what is also interesting is that when I search for the topic I put in on the forum, it tells me nothing is there or the words are too long, etc. I change wording around and still get the same problem. I google it and then find somethings on the forum

Codes with engine OFF:
1-86
2-82
3-89
4-85
5-87
6-98
7-05
8-82
9-27
10-5.7
11-0.3
12-4.3
20-3.2
21-32
22-00
23-32
24-11.4
40-164
41-85
42-104
43-136

Error codes:
eb 1235
cleared it and then no error codes

Codes with engine ON:
1-85
2-82
3-89
4-80
5-93
6-182
7-08
8-100
9-31
10-2.3
11-0.8
12-4.3
20-3.2
21-42
22-00
23-32
24-13.3
40-164
41-85
42-104
43-136

No error codes

I did the flap test but honestly I couldn't tell any difference or that sound

Thanks!!
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post #2 of 29 (permalink) Old 05-19-2019, 10:58 AM
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Originally Posted by shadypa View Post

1-85
2-82
3-89
4-80
5-93
6-182
7-08
Second set of values with engine on. Is compressor running and right side cooling?

1-85
2-82
3-89
4-80
5-93 Evaporator temp too high. Should be ~40
6-182
7-08 Refrigerant pressure too low. Should be 12-14 bar.

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post #3 of 29 (permalink) Old 05-19-2019, 11:01 AM
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Put a can of R134a, and then test it again.
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post #4 of 29 (permalink) Old 05-19-2019, 11:07 AM Thread Starter
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Thanks for your quick response!

Yes, the right side is cooling while the engine is running so I assume the compressor is running. When my wife is driving, she has the passenger vents facing her towards her as much as possible

What do I do about the below?
It doesn't make sense to me why it would be cold only on one side.

5-93 Evaporator temp too high. Should be ~40
7-08 Refrigerant pressure too low. Should be 12-14 bar
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post #5 of 29 (permalink) Old 05-19-2019, 11:15 AM
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Some people have some conspiracy theories that the Germans are trying to penalize you, the driver, (not your innocent wife), by not taking care of your air conditioning system

The expansion valve is closer to the passenger side of the evaporator. If you have insufficient refrigerant, by the time it gets to your side, it has already turned to gas from liquid. So, not much to cool your side.
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post #6 of 29 (permalink) Old 05-19-2019, 11:15 AM Thread Starter
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Please excuse my ignorance.
Any particular brand?
links as to how to do it properly? I found this one, good?: You are being redirected...
Is there is a leak since it is low?
Thanks!!
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post #7 of 29 (permalink) Old 05-19-2019, 11:16 AM
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Originally Posted by shadypa View Post
Thanks for your quick response!

Yes, the right side is cooling while the engine is running so I assume the compressor is running. When my wife is driving, she has the passenger vents facing her towards her as much as possible

What do I do about the below?
It doesn't make sense to me why it would be cold only on one side.

5-93 Evaporator temp too high. Should be ~40
7-08 Refrigerant pressure too low. Should be 12-14 bar
For a/c to cool well evaporator has to be flooded with liquid refrigerant. Your system is low therefore only right side has liquid. If you run blower on low you will hear hissing coming from center of the dash.

If you are brave shoot a can in it. Otherwise have it recovered evacuated and recharged with ounce of oil dye mix and 1000 grams of R134A.
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post #8 of 29 (permalink) Old 05-19-2019, 11:24 AM
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The first measurements seem to be done with engine warm, so it is useless for sensor calibration test.
The 2nd test is not saying what stage of engine running it is on, so impossible to tell what happen to the compressor.
Repeat measurements 1st thing in the morning with engine off and before car temp can be affected by sunshine.
2nd test should be done on hot car just seconds after engine start. Point is to get the computer at moment when it calls for max AC output.
Best yet, when you come to hot car, start with displaying #7 pressure value, then start the engine and observe changes.
5 bars static refrigerant pressure should still get compressor running.


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Last edited by Kajtek1; 05-19-2019 at 11:26 AM.
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post #9 of 29 (permalink) Old 05-19-2019, 11:38 AM Thread Starter
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Quote:
Originally Posted by Kajtek1 View Post
The first measurements seem to be done with engine warm, so it is useless for sensor calibration test.
The 2nd test is not saying what stage of engine running it is on, so impossible to tell what happen to the compressor.
Repeat measurements 1st thing in the morning with engine off and before car temp can be affected by sunshine.
2nd test should be done on hot car just seconds after engine start. Point is to get the computer at moment when it calls for max AC output.
Best yet, when you come to hot car, start with displaying #7 pressure value, then start the engine and observe changes.
5 bars static refrigerant pressure should still get compressor running.
First measurements were done in my garage about 6 hours after she drove it. I live in Houston.
Second measurements were done immediately after I did the first with the car running.
I don't understand "what stage of engine running."
Remember, I'm ignorant, can't you tell?
Does "when you come to hot car, start with displaying #7 pressure value, then start the engine and observe changes" mean that after the car has been running for a while, turned off for a few minutes? or does it mean to leave the car outside in the sun and check it?
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post #10 of 29 (permalink) Old 05-19-2019, 12:00 PM
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Porpoise of first check is to spot temp sensor that has drifted in value. Values of 1-6 should be equal +/- 2 degrees. That's why it is best done after overnight rest.

Value #7 will be highest with hot engine/hot interior few minutes after compressor engages. Electric condenser fans will be running on high. Of course that applies to properly charged and functioning system.
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