Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-21-2013, 01:06 AM
Krystyna's Avatar
Registered User
 
Join Date: May 2013
Location: Austin, Texas
Posts: 6
AC issues 2001 E320

AC wasn't warm but not as cold as usual, I've had this car 3 years and no AC work done, not sure if there was any done prior to my ownership....had dad put some refrigerant in and it started getting warmer instead of cooler, can was empty so we left it alone. Next day omw to work nothing would blow out, me knowing not much about AC systems thought he overfilled it so I let all refrigerant out. Ec light came on, I started researching and realized the blower wasn't on, I took apart the dash an cleaned up tge blower motor and it started back working, tried adding refrigerant but gauge showed too much pressure with less than a can put in, I let all of it out of system so it should be able to take in minimum 2 cans, anyhow did more research and learned the compressor needed to turn on for freon to circulate, after 2 days of trying different things, including vacuuming the system and recharging, I learned how to reset it by erasing codes in climate control dash, it worked, compressor came on but is still showing really high pressure while putting in refrigerant, warm air still blowing out too. Well kept messing with it and decided to check passenger vent and it was blowing cool, drivers side still warm, added more freon, got a can, well almost can to go in, now I have about 23ounces in there, maybe 24, drive to the attire and while car is moving the driver side blew cooler, not a cool as passenger, but cooler, when I stop it goes back warm on driver side. I went in the store and when I started car EC was back on...ughhhh...I reset again, compressor clicked backed on, but is of again, it comes on every time I reset it but I have to reset after I turn car of more than 5 minutes now. Btw, while vacuuming it pulled to -31 & held that number fit 20 mins after I turned off vacuum so i'm assuming there is not a leak in the system...can I get some clues of other things to check, i'm kind of broke so am trying to do this on my own but am getting totally frustrated now. Thanks in advance. S/N... I vacuumed again after getting the compressor to come on as well.


Last edited by Krystyna; 05-21-2013 at 01:10 AM. Reason: added more info
Reply With Quote
  #2  
Old 05-21-2013, 01:14 AM
ps2cho's Avatar
Registered User
 
Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,525
First stop throwing cans in it it is illegal to be venting all of that.

What is "really high pressure" ? Scan the codes in the climate control unit with the A/C running -- what is the evaporator temperature?
__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
Reply With Quote
  #3  
Old 05-21-2013, 01:21 AM
Krystyna's Avatar
Registered User
 
Join Date: May 2013
Location: Austin, Texas
Posts: 6
My dad had me emptying the refrigerant into a bucket...is that ok or is there a better way? I will run the codes and post them first thing in the morning. I had run them and didn't understand a bit of what they meant and was looking it up on here but couldn't figure it out so when I post them an explanation will be awesome.
Reply With Quote
  #4  
Old 05-21-2013, 01:22 AM
Krystyna's Avatar
Registered User
 
Join Date: May 2013
Location: Austin, Texas
Posts: 6
I responded in my own message, just realized I can reply to yours, sorry.
Reply With Quote
  #5  
Old 05-21-2013, 01:23 AM
Krystyna's Avatar
Registered User
 
Join Date: May 2013
Location: Austin, Texas
Posts: 6
Both the low and high sides were reading 89 btw
Reply With Quote
  #6  
Old 05-21-2013, 01:38 AM
ps2cho's Avatar
Registered User
 
Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,525
The compressor is not engaging hence the readings. For Texas this time of year, you are looking for about 40psi low and ~220psi high.

Emptying into a bucket? I think neither of you guys should be touching expensive A/C systems right now in my opinion.
__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
Reply With Quote
  #7  
Old 05-21-2013, 01:57 AM
Krystyna's Avatar
Registered User
 
Join Date: May 2013
Location: Austin, Texas
Posts: 6
You're right, I probably shouldn't be touching it, but I have no choice, single, 3 kids, one job...almost impossible to afford AC work, so I apologize for doing it my self but I really don't have a choice right now, thanks for helping me out though ;-).
Here are the codes, car was on, AC running, compressor and clutch are engaged, both sides are blowing cool now?? Weird..
1-80...2-91 to 103, it's varying...3-46...4-46...5-46...6-182...7-14...8-136...9-28...10-0.8....11-2.3...12-4.3. The other diagnostics showed no errors, but this was the side I cleared originally to reset the compressor to get it to run at first. Thank you.
Reply With Quote
  #8  
Old 05-21-2013, 08:33 AM
Registered User
 
Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
i wouldn't worry too much about venting the system.... look what the corporate world puts into the water and air.

i think it might be worth a diagnostic trip to an ac guy...he could at least tell you what is wrong.


then you make repairs when you can... maybe it will just be a hot summer this year....

how did we survive as kids? i remember we even had to roll down our own windows
__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]
Reply With Quote
  #9  
Old 05-21-2013, 10:41 AM
Registered User
 
Join Date: Nov 2004
Location: Dallas, TX
Posts: 5,078
If the fan is not blowing, then your problem is 99% the blower motor regulator. It's a common issue on the W210 and new regulators can be bought for about $80-90 for the the Behr brand. Cheaper can also be found, but they do not last.

Once you replace the regulator, the fan will work well again. Now that you've evacuated the a/c system. You'll need to pull a vacuum before charging the system. If you don't have a vacuum pump, take it to any mechanic shop that offers an a/c service. This is basically a vac and charge.

They usually charge about $30 for the vacuum plus the cost of the freon, which they can add by weight, so it will be the exact amount that your car needs.

Good luck.
__________________
With best regards

Al
Reply With Quote
  #10  
Old 05-22-2013, 01:09 PM
Krystyna's Avatar
Registered User
 
Join Date: May 2013
Location: Austin, Texas
Posts: 6
Thanks guys.... @alabbasi the blower is working. I also pulled a vacuum and recharged the system, no leaks....it seems to have a block though, like freon doesn't seem to circulate throughout the system correctly. Does anyone know the meaning of the sensor values I posted?
Reply With Quote
  #11  
Old 05-22-2013, 01:16 PM
Registered User
 
Join Date: Nov 2004
Location: Dallas, TX
Posts: 5,078
Is the compressor running and did you put gauges on it? what was the high and low pressure readings at idle and when you revved the motor?
__________________
With best regards

Al
Reply With Quote
  #12  
Old 05-22-2013, 03:20 PM
Registered User
 
Join Date: Jun 2000
Location: Plano, TX
Posts: 2,559
Quote:
Originally Posted by Krystyna View Post
Thanks guys.... @alabbasi the blower is working. I also pulled a vacuum and recharged the system, no leaks....it seems to have a block though, like freon doesn't seem to circulate throughout the system correctly. Does anyone know the meaning of the sensor values I posted?
Here is what the readouts mean:

1. In car temperature, from the sensor near the dome light: 80 degrees F.
2. Outside temperature sensor: 90 -103 degrees. Not sure where this senor is located.
3. Left heater core temperature: 46 degrees.
4. Right heater core temperature: 46 degrees.
5. Evaporator temperature sensor: 46 degrees.
6. Engine coolant temp: 182 degrees.
7. Refrigerant pressure: 14 bars (~198PSI)
8. Refrigerant temperature: 136 degrees.
9. Not used.
10. Blower control voltage: 4.3v (range is 0-6)

The numbers don't look too bad, and nothing abnormal. Ultimately you want to evaporator temp to drop another 10 degrees, but whether or not you have a problem depends on how long the car had been running, how hot & humid the weather was, etc.

If it's still not cooling well, I think you need someone with a real set of guages to check the high & low side pressures. As well look for a restriction in the high side line. You can find restrictions by checking the temperature of the high side line (see item 8 above) while the a/c is running. It will be hot until the restriction, after which it becomes cold.
Reply With Quote
  #13  
Old 05-22-2013, 03:39 PM
Banned
 
Join Date: Dec 2007
Posts: 5,061
I've learned that there are many repairs that can be performed DIY. For myself, there are four items that I outsource to professionals. However, I am very very particular when it comes to the professionals I outsource to.

1. A/C work. A/C is a complex subject and IMHO, requires the services of a professional. For every ten hours I spend screwing around with the A/C, a professional will have the problem solved in less than ten minutes. My time is worth SOMETHING.

2. Transmission repair. Let's face it, transmissions are big and HEAVY and require a degree in rocket science to repair. Again, what would take me ten hours to accomplish will be accomplished in one hour by a transmission specialist.

3. Timing chain replacement. Yes, I know many on this forum have accomplished this feat by themselves. One thing for sure, screw up this job and you may end up buying a new engine. IMHO, not worth it, enjoy a Pepsi while your local professional engine man changes the timing chain.

4. Front end and suspension work. I don't enjoy lying on my back for hours staring at the underside of a car. Screw up a spring install and it could kill you. Let someone else break their nuts on these repairs. I have no problem in paying for this service.

For the most part, I'll get in and attempt anything else. DIY repairs can be enjoyable and there is always something to be learned.

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 12:04 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page