Hi,

I have a 98 E330 TD and I am having a strange A/C issue. When I turn the air on it works on the passenger side, but blows hot on the drivers side. I took it to a local tech who told me that it was the controller in the dash, so I replaced it, and I still have the same problem. There is plenty of refrigerent in the system, and as I said, the passenger's side blows cold. Any help would be appreciated.

Orlando

My money says the tech was not a Mercedes tech. Not an uncommon problem. Probably a sensor or low freon level. Do a search - lots of similar problems like yours discussed.

Len

I would think Duo -Valve they are open by default. See the troubleshooting guide
http://www.continentalimports.com/ser_ic40142.html

YES, have the refrigerant evacuated & then re-charged to the correct level BEFORE spending any MORE $$$

__________________
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Wow,

I am surprised that after telling you that the level was checked and one side blows cold that 2 of you would recomend looking at the level or evacing the system. Are you saying it is normal for a system to blow cold on one side if the refridgerent is bad, since I know it's not low, it can only be bad (can it go bad) i guess. Also, Peter, I went to the page that was linked, great info, sadly, you were betting it was a duo-valve, and I don't see any test for that at all. Oh well,

Orlando

MB Doc is saying that he doubts that you evacuated the system to measure the level. Otherwise you're guessing.

When the refridgerant level is slightly low on the 210, it does exactly what you describe. Since your symptoms EXACTLY match what we've seen with these cars, do you suppose that perhaps we're not talking out of turn?

Matt,

I never said anyone was talking out of turn, I said I was surprised. Point of fact, I never even said I wouldn't try it. As for the level, it was measured by the tech (no, not a MB tech, just an Import tech) and since I didn't pay for an evac and recharge, I am pretty sure he didn't do one. Now, I am only asking this to gain knowledge, so please don't take this the wrong way, but are you saying the levels are different then what they really are if you just measure them, and the only way to get a true reading is to evac the system and recharge it properly?

Thanks,

Orlando

I was reading a document last night which suggested that low refridgerant levels cause drastically lower oil circulation in the system, with a lot of the oil remaining in the evaporator.

Do you suppose that the left side of this evaporator somehow holds a bunch of oil when the refridgerant is slightly low? Clearly the right side is not affected nearly as much.

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