W210 E320 A/C Driver side hot, Passenger side cool SOLVED!!! - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 07-08-2007, 02:00 PM Thread Starter
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Cool W210 E320 A/C Driver side hot, Passenger side cool SOLVED!!!

For almost a year my A/C had been making this slight hissing sound but I dismissed it as "normal". Wrong. At the same time, the driver's side was roasting hot outside air and the passenger side was the only one that cooled down. One day, all cool air stopped. I immediately shut down the A/C and went to the local shop here in VA that works on Benzes. ( A previous trip to the dealer in Sarasota, Fl resulted in two techs recommending a compressor after looking at it for about 5 minutes. No thank you. ) Anyway, the local shop evacuated the system and replaced a hose on the low side ( apparently the side that had some sort of connection to the driver's side ) and did a recharge. It lasted for one day. I soon went back to the shop and they did another evacuation. The mechanic noticed that there was some blockage of debris and material in the freon. Yikes! Anyway, after a second recharge it worked. I now have ice cold air, no hissing and it has been good to go for over two months now. My black on black color combo forces me to use A/C though I avoid it if possible.

Moral of the story? Before you toss $$$ at new parts, have the mechanic check for worn hoses, do an evac and a recharge. Try it again if needed. I spent about $230 for the two charges etc... Beats $1400+ for a compressor that I did not need. I hope that this helps.
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post #2 of 10 (permalink) Old 07-08-2007, 03:29 PM
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What makes you thinking that $1400 for new compressor at the stealership would clear the debris?
Welcome to the forum.
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post #3 of 10 (permalink) Old 07-08-2007, 09:17 PM
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Katjek, I don't think that was what he was saying. You may want to read again.

'87 300E: sold after 11years @ 230k & still on the road somewhere in rural Tennessee.

'94 C220 with 93k totalled 10/06 by hit & run broadsiding monster truck: not a scratch or bruise for me
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post #4 of 10 (permalink) Old 07-08-2007, 11:56 PM
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Quote:
Originally Posted by johnamoss
Katjek, I don't think that was what he was saying. You may want to read again.
I understood he refused changing the compressor but I'm clearly too simple to follow the exact cause of the problem.

I have not had a problem like this but it was previously mentioned that low freon (R134a) would result to the issue of cold only on the other side. On the other hand, the evaporator is common, even on a 4-zone W211 system. I cannot understand how it could then make only the other side cold.

Fescudder clearly had low freon but also some hoses fixed. Looking at the W210 air hoses
Ê*ò*ëîã
I assume it would not blow hot air but instead would not blow at all on the driver's side when it gets hot?

A/C normally blows mainly from the upper nozzles, cool air goes downwards anyway. When the driver side is hot, does it blow cold from the centre and the passenger side?

Where was it actually leaking freon if not from the compressor (and the compressor was not serviced?). Was that fixed or was it just some "normal freon leakage" that happens all the time and does not need service but just fill up after some years of usage?

On the hissing sound, the evaporator by default makes some hissing sound when the liquid freon evaporates to gas. I have to say I don't remember noticing that from my current cars but it just has to be attenuated efficiently, probably detectable when switching off engine and blower, for a while when the system still has freon pressure (or perhaps even this is electronically switched off today).
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post #5 of 10 (permalink) Old 07-09-2007, 05:17 PM Thread Starter
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No problem. The center driver's side vent and the driver's vent near the window were blowing hot. The pass side was cool and the pass center vent was cool. The hissing got worse over the course of a year. The mechanic only noticed that one hose was bad and he replaced that. I never knew that I had "blockage", but that was what the mechanic said after I took in my car the second time. Remember, I got about one hour of cold A/C, then it blew hot again. The freon was still in the system according to the mechanic. After a second evacuation of the freon (and debris) and another recharge, the system works beautifully. Ice cold on demand right away. I love it.

Regarding the dude who mentioned that I thought a new compressor would clear my blockage.... read my first post really slow, then re-read it again. It clearly never stated that I thought a new compressor was the answer to my prayers. The MB dealership threw out that solution after five minutes. Clearly I would have spent a ton of money on something that I did not need.

So, my recommendation is to do what I did before you go about replacing components, evaporator, condensor or dryer. Also, hold off on the duo-valve actuator. Try it... you may save yourself a great deal of money. Good luck.
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post #6 of 10 (permalink) Old 05-03-2013, 02:38 PM
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My 1997 E-420 after hmmm over 15yrs started having this problem this week as we hit our first heat wave here in SF.
Anyway, I've read through the related posts and I sure would love to get my hands on any sort of diagram, schematic, or any kind of image that might show basic work-flow operations of the E-class climate control, plumbing, etc.

What's puzzling is that, with therm set to 70 on both sides, passenger is blowing ice-cold air, while the far left vent by the door is blowing scorching air, might as well be coming from a pizza oven! and the driver side center console vent is luke warm!

So I'm trying to make sense of this. Obviously the AC is functioning, compressor has to be working, the Freon in the condenser has to be sufficient otherwise the passenger side wouldn't be chilling so nice! The strange thing is for my side to be blowing 95 deg heat, the damn heater valve has to be cocked wide open, otherwise that air just doesn't get so freak'n hot only due to inefficient AC not running at 100%

Is anybody with me on this?

I called the dealer and service adviser told me one of the sensors must be bad and throwing the system into fault mode.
They charge $300 just to evac and refill the AC, so I don't think I'll ask them to troubleshoot this, I don't have $1,400 for a new compressor either!
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post #7 of 10 (permalink) Old 05-03-2013, 03:38 PM
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Your car is W210 body and there is pretty good guidance in stickies in W210 section how to troubleshoot your car.
Your system is low on refrigerant, or has electronic glitches.
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post #8 of 10 (permalink) Old 06-26-2013, 05:37 PM
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I have a '97 E420 that had the EC light on. I cleared the error codes and added refrigerant. The compressor kicked on, however only the center vents are blowing cold air. The diver's and passenger's side vents are blowing hot air, along with the center rear vent. Any ideas?
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post #9 of 10 (permalink) Old 06-27-2013, 12:09 AM
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Refrigerant levels are still probably off.
Without a vacuum pump and a set of gauges it is impossible to know if you have the correct amount of R134a added.

The AC parts are too expensive to just add cans of R134a. I would take it to a reputable service shop and them use their dedicated AC machine to vacuum it down and then add the precise amount of oil and R134a to the car. All should be well then.
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post #10 of 10 (permalink) Old 06-27-2013, 12:28 AM
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the 1997 E class with W210 body has sensors display on LCD panel, what makes for easy troubleshooting. Go to the body section and find the procedure in stickies.
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