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
  #31  
Old 06-26-2008, 07:13 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Pic131 to Pic135

Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic131.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic132.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic133.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic134.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic135.jpg  


Last edited by BoxfordBenz; 06-26-2008 at 08:53 AM.
Reply With Quote
  #32  
Old 06-26-2008, 07:15 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Pic136 to Pic140
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic136.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic137.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic138.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic139.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic140.jpg  


Last edited by BoxfordBenz; 06-26-2008 at 08:54 AM.
Reply With Quote
  #33  
Old 06-26-2008, 07:17 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Pic141 to Pic145
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic141.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic142.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic143.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic144.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic145.jpg  


Last edited by BoxfordBenz; 06-26-2008 at 08:54 AM.
Reply With Quote
  #34  
Old 06-26-2008, 08:24 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Pic146 to Pic150
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic146.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic147.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic148.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic149.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic150.jpg  


Last edited by BoxfordBenz; 06-26-2008 at 08:54 AM.
Reply With Quote
  #35  
Old 06-26-2008, 08:26 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Pic151 to Pic155
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic151.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic152.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic153.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic154.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic155.jpg  


Last edited by BoxfordBenz; 06-26-2008 at 08:54 AM.
Reply With Quote
  #36  
Old 06-26-2008, 08:28 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Pic156 to Pic160
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic156.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic157.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic158.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic159.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-pic160.jpg  

Reply With Quote
  #37  
Old 06-26-2008, 09:01 AM
Registered User
 
Join Date: Apr 1999
Posts: 2,638
You've been a busy bee.

I can't wait to see more.

Can you show us via picture, of where your evaporator failed ?

Please see my post here:
WTD: current W124 BEHR evaporators pics: no more dissimilar metals ?

:-) neil
Reply With Quote
  #38  
Old 06-26-2008, 09:42 AM
BoxfordBenz's Avatar
David Selig
 
Join Date: Jun 2008
Location: Harvard, MA
Posts: 44
Evaporator Leak?? and Blower Motor Orientation Problems

Quote:
Originally Posted by ke6dcj View Post
Can you show us via picture, of where your evaporator failed ?
I do not have convincing proof that the evaporator did fail. The best pictures is Pic147 and that doesn't show a leak. I found a large amount of dust on my evaporator when I replaced my blower motor about 6 months ago. I had had an ongoing leak from my AC which the dealership could not locate. Then I noticed that the heating in my car had also become weak, seemingly due to low output from the blower. All this made me think that the problem was the evaporator - a leak in a place where the dealership would not look, compressor oil leading to buildup of dust on the evaporator, and consequent poor heating output due to low airflow that did not improve with the new blower motor and vacuuming because of dust lodged within the fins of the evaporator.

It turns out my reasoning was faulty. After putting the new evaporator in and partially reassembling everything, I checked my airflow and found that it was still lousy - plugged evaporator fins were not to blame. I then opened up another of my cars in which the airflow was relatively good but in which the blower motor would occasionally not start. In that car, I suspected that the brushes were to blame since the voltage to the blower motor regulator was normal (I have 3 of the same car so that I can compare and contrast them). My plan was to replace that blower and use the broken one in this car to test whether perhaps just the blower motor in this car was weak. However, it dawned on me once I looked at the failing blower motor in the other car which had decent airflow that I had installed the new blower motor in the car in this post backwards 6 months ago. After placing the blower motor in this car in the correct orientation, I got the good airflow I was looking for. The mistake occurred because 1) the mercedes instructions did not note orientation as being an issue, 2) I have become used to all parts from mercedes having some mechanism to prevent reverse installation, and 3) the acm blower that I installed had the electrical connection on the opposite side as that of the original Behr blower.

Finally I put the new blower in the other car and found that the little bit of vacuuming I had to done on that evaporator resulted in a noticable increase in airflow. I have attached pictures of the dust before vacuuming on that car.

To summarize:
1. I don't know for sure that my evaporator failed.
2. In my experience vacuuming even a moderate amount of dust off the evaporator improves airflow.
3. It is easy to install an ACM blower backwards and significantly reduce airflow.

None of this is included in the original post because it had little to do with the "how to replace this" nature of the post.
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-img_0220.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-img_0221.jpg  
__________________
1991 300TE 4matic 205k miles (bought 2000)
1992 300TE 4matic 200k miles (bought 2000)
1992 300TE 4matic 150k miles (bought 2004)

Last edited by BoxfordBenz; 06-26-2008 at 01:05 PM.
Reply With Quote
  #39  
Old 06-26-2008, 10:55 AM
Registered User
 
Join Date: Apr 1999
Posts: 2,638
Quote:
Originally Posted by BoxfordBenz View Post

However, it dawned on me once I looked at the failing blower motor in the other car which had decent airflow that I had installed the new blower motor in the car in this post backwards 6 months ago. After placing the blower motor in this car in the correct orientation, I got the good airflow I was looking for. The mistake occurred because 1) the mercedes instructions did not note orientation as being an issue, 2) I have become used to all parts from mercedes having some mechanism to prevent reverse installation, and 3) the acm blower that I installed had the electrical connection on the opposite side as that of the original Behr blower.
Funny, the first time I replaced the blower with the ACM unit, the same thing happened, but I caught it right away, before bolting everything up.

The ACM blowers don't have a "polarized"/"keyed" mounting like the BEHR, so you need to take a picture of the blower-fin orientation to remember which way to install the ACM unit.

:-) neil
Reply With Quote
  #40  
Old 06-26-2008, 01:16 PM
Registered User
 
Join Date: May 2006
Posts: 590
Well done

I am preparing to do the evaporator on my fatherís 95 E300 in a few weeks, so I very much appreciate the time you took to post the details of your work!!

I also did battle with an aftermarket blower in my 300TE, and had to modify it's mounting bracket to get it to fit, but I checked it powered on before I reinstalled everything. Bummer that it bit you.

I have the 124 service manual and CD, and have been bookmarking relevant threads as I see them. Yourís will be the first I print out- many thanks in advance.

Dave
Reply With Quote
  #41  
Old 11-26-2008, 11:57 AM
learner30's Avatar
Registered User
 
Join Date: Nov 2008
Location: savannah, georgia
Posts: 5
Thank you for the pictures. They have been helpful for reference. My 1992 300TE has a leaking evaporator, and other A/C leaks, which this is the first time I have done this job. It is a good learning experience without breaking everything.
Reply With Quote
  #42  
Old 07-01-2009, 11:09 PM
Registered User
 
Join Date: Dec 2000
Location: AL
Posts: 1,219
David, this is an incredible write-up! Very Impressive.
__________________
2012 E350
2006 Callaway SC560
Reply With Quote
  #43  
Old 07-01-2009, 11:40 PM
Registered User
 
Join Date: Nov 2007
Location: Los Angeles
Posts: 27
Quote:
Originally Posted by ke6dcj View Post
You've been a busy bee.

I can't wait to see more.

Can you show us via picture, of where your evaporator failed ?

Please see my post here:
WTD: current W124 BEHR evaporators pics: no more dissimilar metals ?

:-) neil
Here is a pic of the evaporator leak and evaporator/heat core assembled.
Attached Thumbnails
W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-ac-evaporator-016.jpg   W124 (124.290) Evaporator, Vacuum Pod, and Bulb Replacements-ac-evaporator-010.jpg  
Reply With Quote
  #44  
Old 10-20-2009, 12:39 AM
hamrt's Avatar
Registered User
 
Join Date: Sep 2009
Location: Apple Valley, CA
Posts: 22
This is a great post. I wish I could find detailed instructions and photos for other repairs like removing door panels, for example. But I can't believe you did all that work, practically dismantling the whole car, it seems, only to find the evaporator was most likely not the problem. Thanks for the note about the blower being able to be plugged with reverse polarity. I will keep that in mind if I ever have to replace it. This also sounds like a good lesson in why to replace the cabin filters on a regular basis.
Reply With Quote
  #45  
Old 11-29-2009, 02:05 PM
Registered User
 
Join Date: Nov 2004
Location: Qualicum Beach BC
Posts: 19
Many thanks for taking the time to do such a detailed summary of the repair.
In fixing a baulky blower motor on my 92 300 TE4 I found a wet evaporator so will be undertaking this same repair soon.

Jim Cross

__________________
92 300 TE 4matic
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 06:08 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page