EdzBenz

The A/C system in my E300 isn't blowing cold air. I'm pretty sure its got a leak on it, but haven't pulled any codes for diagnostics yet to really determine. I realize this is faux pas, but my mechanic and I filled up my completely empty sytem over the weekend with fresh R124. 2lbs in total. Everything worked great once the system was recharged. Ice cold. Where are some common areas on the A/C system to cause leaks? Can these leaks be fixed via DIY, or should I have a pro do the job?

The compressor/dryer has been replaced on the S500 3 separate times! My hope is that this isn't the case for the E300.

mwalkerd

same issue again for me - my 98 w210 did it, now my 2000 w210 is doing the exact same thing - ohlord is my hero for most everything

Geh

When my AC wasnt blowing cold air turned out to the the Evaporator switch appartently a common problem?

210lvr

evaporators are somewhat common. there is also a hose coming off the receiver drier shaped like an s which leaks all the time. i occasionally see compressors leak as well. best thing is to get a fresh evac and recharge with leak dye. once the dye is in, the leaks are easy to find. for the evap, just check your garage floor after a few days. hopefully you dont have any leak dye on the floor from the drain tubes.

jlmills

I have a 2001 E430...When I turn my A/C on, the controls on one side is stuck on Auto, and the other is set to blow out of the defrost vents. I cannot get it to do anything as far as changing the settings. The compressor isn't coming on, and my fans under the hood are constantly running. No change even when adding refrigerant.

TMAllison

Your EC light should be constantly lit if the AC system has a critical fault.

Have you tried pulling AC actual values and codes from the CCU?

martythebrit

Our mechanic has told us that the two AC hoses need to be replaced on our 96 E320. We have the hoses but he’s unable to do the job.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
How much should the labor run on this job and are there any other expenses apart from the hoses?<o:p></o:p>
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speedn_j

how did you clear the codes?

ohlord

both auto buttons while in the error reading mode

pdodee

I've just spent the last hour reading every post in this thread and only one person seems to have a similar problem as me and I'm already $1200 in the hole trying to fix it.

Problem: Climate control unit initially works fine on start-up. After about 10-20 minutes the fan starts to fade away even though screen says it should be on high. A few minutes later it will turn back on to max and then slowly go down again. This cycle repeats and I have no control of the fan, even in manual mode.

Solutions tried: replaced regulator, didn't solve it. Then sent control unit in to be tested. Apparently there was a problem so they "rebuilt" it. Got it back yesterday and the problem's still there.

Note: I just got the 2002 E320 wagon in November, and this problem didn't start showing itself until spring with the AC on. HOWEVER, it will do the same thing even if I have the EC button turned on.

My next step is obviously looking to replace the blower, but I'd REALLY like to stop just throwing money at this problem! Any help or advice is very much appreciated!

Here are my codes (first one is when things seem normal, second is when it's wacky):

1 = 25, 34
2 = 25, 26
3 = 03, 07
4 = 03, 07
5 = 02, 05
6 = 86, 88
7 = 11, 09
8 = 35, 44

No error codes.

Thanks.

johnjzjz

Hi I bought a 97 210 sedan with an AC problem

i had a blower problem as well and it turned out to be the resistor control for the blower motor speed - ( mine only came with a new blower motor but found a fix from another model PRICY to buy together resistor was 25 bucks i think ) its located in the blower box, as mine would only run at low speed and showed hi on dash control < i could see the resistor control doing what yours is doing as well < its the way the unit works if you have not had it fixed yet i can supply the # for the resistor and directtions to install - jz

pdodee

JZ, thanks for the reply. Yes! I'd be very interested in learning about your fix and how you did it. You're saying that it's a resistor that exists on the blower motor assembly? Or are you talking about the blower motor regulator (sometimes called resistor I think)? Because I've already replaced that (part # 2108211551).

Thanks again for any help.

johnjzjz

You might have this already i am not up on what this site offers hope my link works -- jz

http://www.eclassbenz.com/2010/02/ho...-malfunctions/

Fabio D

Friends i have a trouble in my E55 when i depress the acc pedal in the driveway the center vents comming to blow normal/ambient temp air instantly when i lift the acc pedal & the car runs by inercia they comming to blow cold air

I think the problem is caused by the vaccum lines, i want to hear about someone have this issue & whats the cause/problem?

(Forgot to tell: "No codes" in the HHT)

Fabio Daniel

kinghais

hi guys i just got a 96 E300 and i have some problems with ac, i tried to read the codes but i can't cause right side screen has bad pixels so i cant read'm.
driver side blows hot air and pass. Cold, when both in LOW temp.
when i turn it on and off i hear loud hissing sound from center vents
Helps please

autoevolve

Normally happy with the way AC works as long as I start in garage the 105 temp outside are no problem just when car sits in heat doesn't catch up....Thanks for the help....Julia
1 28
2 39
3 17
4 13
5 20
6 74
7 14
8 55

autoevolve

Anyone have a picture 1997 e420 where do I add R-134

soup12

Hey everyone,

I have a 2001 E320 and the AC blows cold air when it's working properly but many times there is no air coming out of the vents (even when the fan control is set to max). It seems like the car does not properly sense the temperature and adjust the climate control accordingly. I think the dealership refilled r134 a few months ago but that did not solve the problem. Any advice would be appreciated. Thanks!

Here are the codes:
1 = 103
2 = 102
3 = 85
4 = 91
5 = 44
6 = 188
7 = 15
8 = 116

EB1234
EB1235
EB1416

jc martins

hi i m new on the side i ave class E 320 i just ave thes problem : the a/c works but no cold air, i listen a whisle on the vents , could be low pressure on the system? could be a leak? i been reading the problem of semikolon and the answers of all of you guys. it's great the feedback i appricate some appions. thanks
p.s. should the fans in the front of the radiators should be working with the a/c on?
thanks one more time.

mrizzo1963

hi, first the fans go on/off with the cycle of the a/c clutch, if the ec light is on the control and the comp is clicking in & out it has a leak or low. good luck

jc martins

thanks for the help i going to chek sistem one more time thanks bye

gotboost95

Did you find a fix for this yet? I'm having a simular problem with the ac on doesn't matter what position the fan is on the ac works when it wants. Turns on for minutes and then off for a few minutes. It's pretty random and it's with the ac or heat it just works when it wants. Any suggestions would be great!

jc martins

hi
thanks to share oll info.

Ok whend t turn the a/c on,the funs do not work ( in front of the car)

I ave all the functions on the panel butit seems that do not have to much air out.

rebooted the sistem but keep the whistle.
if the funs is not working something ave to be whong?

thanks one more time for tha help.

gotboost95

TTT
Any ideas what I should look at first?

pdodee

I updated my fix in another thread. In a nutshell, it turned out that the regulator that was originally replaced as a fix for the problem was a knock-off (not an original MB part). When we put in the legit MB regulator everything has worked fine since (4 months of summer).

Basically the knock-off regulator was overheating and then resetting once it cooled down. Hence the random fan behaviour. As long as you get an OEM part the repair can be done yourself with a few screwdrivers in about half an hour, if you don't mind bending yourself into the passenger footwell.