1999 W210 E320 A/C problems - PeachParts Mercedes-Benz Forum

Rahulio1989300E · #1 05-28-2006, 01:11 AM

Hello everyone,

I am having some trouble with an E320. (~57,000 miles)

Here is a short history,
About 1 year ago, the driver's side speaker in the dash quit. I ignored it since it seemed very hard to remove the speaker from the dash.

Then, shortly after that (1 month maybe), The driver's side a/c vent only blew warm to hot air, even though, the system was set for cold air. All other vents worked fine. Took it in the Park Place for diagnostics, suspected that one of the ac doors in the dash stopped working. Made sense to me, but my father and I could not justify the $1300 price tag in labor alone.

Before we could get a second opinion, I had to leave for college, and my father kinda forgot about it.

So, now, as of about 1 week ago, the entire ac system is stuck in economy mode. The EC button below the lcd screen always has its red led on no matter what, pushing it does not make it go away.

Every vent now blows air in similar the the temp outside the car, as the EC mode does not allow the AC compressor to work. So no more cooling.

I am in a bit of a Mercedes-Benz crisis, my 1989 300E had developed a coolant leak which the source is still to be determined... and now my mom's car is acting up even more.

I want to really get the ac going for my mom, its hitting 90 to 100 now in Texas, and windows down is not that helpful...

Please give me suggestions and if you can, instructions on how to access the dashboard components. I am constantly learning about these cars, I have done a lot of work on my 300E by myself, I know that 10 years of tech has made everything more complex, but I am willing to try. If I cant do it, it will go to our trustworthy Mercedes-Benz indy shop.

Once fixed, I think this car is going to be sold... sad to see it go, but it has had problems...

Thank You,
-Rahul

Matt L · #2 05-28-2006, 10:21 AM

Your climate-control pushbutton unit gives you lots of information. Search for N22 here, and learn how to extract the current sensor values and any trouble codes. Do so, then get back to us.

sokoloff · #3 05-28-2006, 10:25 AM

Had the same problem a few years ago. See my fix here - 210 chassis climate control problem

Some say you only need to recharge the system and maybe add some dye to find the leak. MB says you always must replace the sensor and reprogram the unit as indicated in my thread. A common leak area is the short one foot hose from the receiver/drier to the compressor. Look for oily residue at the R/D end.

BTW, I never had to add any R134 to mine, but I'm now noticing that the driver's side is a little warmer than the passenger side and there might be a little leak at the hose I indicated above. I suspect I'm now due for a recharge.

Len

Matt L · #4 05-28-2006, 10:39 AM

P2 +16 is "Refridgerant fill level check switched off." I doubt that it helped you (but wouldn't hurt). The evaporator temperature sensor was your only problem.

Rahulio1989300E · #5 05-29-2006, 01:02 AM

Wow, thanks for the tips, I will inspect the hoses in the morning, could you please tell me the exact name of the part you replaced under the dash on the drivers side?

Again, thanks a lot!

Matt L · #6 05-29-2006, 08:36 AM

That was his evaporator temperature sensor. While you might want to replace it as a prophylactic, you should check the current sensor values to see if it's the problem first.

Rahulio1989300E · #7 06-03-2006, 04:07 PM

Okay, I got around to doing the tests.

The Fault Codes are:
Eb1227
Eb1241
E FF
E

The Actual Values are:
1 85
2 82
3 87
4 85
5 87
6 85
7 05
8 84
9 27
10 3.2
11 2.3
12 4.2
20 3.2
21 32
22 00
23 32
24 11.3 to 11.4 fluctuating raplidly
40 164
41 32
42 104
43 136

HELP!