E320 1999 W210 Air cooling differences - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 05-01-2004, 07:11 PM Thread Starter
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E320 1999 W210 Air cooling differences

The left side vent air runs warmer than the right side even if the climate control (NEW) is set to the same temp on both sides.
I ran the diagnostic that displays the different codes for the control unit and got the following results:
1 78
2 73
3 heater core left 60
4 heater core right 49
5 evap temp 70
7 refrig pressure 13
8 refrige temp 127


Those seem to be the related readings. Does anybody know why the left core would run much warmer than the right?
The air on the central vents have a noticeable difference in temperature from the left to the right vents.
Any help is appreciated?
Is the air conditioner split in half for each side?
The right side of the car works great.
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post #2 of 6 (permalink) Old 05-18-2004, 12:22 AM Thread Starter
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RE: E320 1999 W210 Air cooling differences

it turned out that the a/c was low on r-132a refrigerant. I bought a "Top-off" can at auto advantage and also a pressure checker for the low pressure side, then added the refrigerant plus oil and soon the evaporator temperature on both sides were down to below 40F and very well matched.
That was an easy one after all.
The hissing sound is gone. I believe it was caused by the low amount of refrigerant moving through very fast through the system due to low volume.

I hope this helps others with similar situations,
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post #3 of 6 (permalink) Old 05-23-2004, 07:27 AM
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RE: E320 1999 W210 Air cooling differences

wont hold

You have a hissing sound becuase some of the gas has leaked out. Look under the car where the hose comes from the condensor to the reciever drier 8 of 10 210's leak there or check condensor
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post #4 of 6 (permalink) Old 08-16-2004, 03:37 PM Thread Starter
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RE: E320 1999 W210 Air cooling differences

So far it is holding,
but I have started to hear that sound again.
Next time I take it for an oil change I will have my mechanic check those areas.
Thanks for your concern and help.
Have a great day.
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post #5 of 6 (permalink) Old 11-13-2004, 07:47 PM
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RE: E320 1999 W210 Air cooling differences

Hi,

I have a similar problem. My driver's side vents will arbitrarily decide to go from cool air to hot air by themselves. I have to run the system in defrost mode for a few minutes and then the system clears and operates normally.

By the way, I think the "hissing" sound you hear is pretty normal. There is a valve that controls the flow of the refrigerant through the evaporator. When this valve cycles on you hear the noise because the liquid passing through the valve boils on the low pressure side.

If you have managed to fix your problem, please post the fix so we can all see what this is. Very odd, the passenger side is not affected. Jim
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post #6 of 6 (permalink) Old 11-15-2004, 05:57 AM
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RE: E320 1999 W210 Air cooling differences

I started heaing the hissing sound a few months ago, ten days ago the AC quit, I did not get the red light in the EC button that shows the level down. I took it to the shop, and they filled the system (empty)and added dye, and guess what they replaced the condenser/drier line since it was leaking
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