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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-17-2008, 10:35 PM
Registered User
 
Join Date: Jul 2008
Posts: 25
newbee here any help would be great

Hi, new to the 1991 300d ,

and I have been looking for vac leaks in the engine area and found two wires off
they sit behind the block, towards center back, next to a red circle under i think the manifold
hooked them up both ways L&R, R&L no difference and hooked or unhooked are they important?
also
more hours have been spent reading threads on vac that I'm sure that if I had a 123 and not a 124 I'd know or be closer to figuring this leak out but I'm still stumped(50k misquito bites also)
no dash switches work only defrost and side vents I thought they worked just before I bought it but I steam cleaned the enigne to see how bad the IJ pump leak was and forgot if they worked, my intrest was with this first
tried to switch the 4&6 pod lines in dash and got nothing
from anyone experince before dash removal where else can i look threads or advise ???
thankyou for your time
Howard

Last edited by tomnscrubs; 07-17-2008 at 10:47 PM. Reason: need help
Reply With Quote
  #2  
Old 07-17-2008, 10:49 PM
awsrock's Avatar
Registered User
 
Join Date: May 2008
Location: Tinley Park, IL
Posts: 612
Welcome!

I have an 87 that also suffers from no center vents..can't decide if I want to go through with the repair

Anyway, here is a thread about removing the dash and replacing the pods on an 87 300d, I don't know that there is any difference between an 87 and 91. Someone else on here can help with that part!

W124 climate control vacuum pod replacement
__________________
Dan
1987 300SDL s200g, Herlevi pump, Elbe manifold, 722.6 collecting dust - 185k
Past: 1987 300D - 264k
Reply With Quote
  #3  
Old 07-17-2008, 10:50 PM
compress ignite's Avatar
Drone aspiring to Serfdom
 
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
welcome

You Will Visit this site:
http://www.w124performance.com/images/
(member GSXR's)

You Will Visit This Site:
http://www.detali.ru/cat/oem_mb1.asp?TP=1&F=124128_15S&M=602.962&GA=722.418&GM=717.437&
(Mercedes Benz Club of Russia maintains an up to date ILLUSTRATED parts
catalog)(on this site always choose the B[as in Bravo]M[as in Motor] option
the SM options show nothing)


You May Try This Site:
http://www.pauldrayton.com/uploadfiles/merc/Service/W124/Index/602_603index.html
(member Paul Drayton's version of factory service manual)

Are the wires to the block heater?
There is a vacuum port block for testing all the pods(+ Lines),you have to
pull out the glove box liner to get to it.
__________________
'84 300SD sold
124.128

Last edited by compress ignite; 07-17-2008 at 10:55 PM.
Reply With Quote
  #4  
Old 07-17-2008, 10:58 PM
Registered User
 
Join Date: Jul 2008
Posts: 25
no the wires come from a factory harness that go further back
have the glove box out no vac there... i think
this is where i tried to switch the 6&4 line to shutoff the defrost no luck
Reply With Quote
  #5  
Old 07-17-2008, 11:02 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,273
There's a device at the back of the injection pump that control engine idle speed. A round red plastic cover is the visible part of this device. With the wires unplugged, idle will probably be something like 500 rpm if the engine stays running. With the wires connected, idle should be 650-700 rpm regardless of load (AC, headlights, etc.).

Somewhere near the fusebox there is a cylinder about 2cm in diameter. It will have one hose from the engine side and two on the windshield side. Of the two on the windshield side, one will go into the cabin, one will disappear below the fusebox. Make sure both hoses on the windshield side hold a vacuum. If not, investigate downstream of whichever hose doesn't hold a vacuum. If both hold a vacuum, you'll probably have to remove that dash :/

Sixto
87 300D
Reply With Quote
  #6  
Old 07-17-2008, 11:07 PM
Registered User
 
Join Date: Jul 2008
Posts: 25
ok dumb question
will the vents work if the AC is low?

WOW these are some nice links thankyou very much .

Last edited by tomnscrubs; 07-17-2008 at 11:17 PM.
Reply With Quote
  #7  
Old 07-17-2008, 11:39 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,273
No relation between refrigerant and the vents. The vents are happy to blow uncooled air if the AC compressor doesn't engage. What the center vents won't do is blow any air if you set ACC for warmer air than is in the cabin.

Sixto
87 300D
Reply With Quote
  #8  
Old 07-18-2008, 12:27 AM
Registered User
 
Join Date: Jul 2008
Posts: 25
thanks AC engages but too low to get cool
just a thought
Reply With Quote
  #9  
Old 07-18-2008, 03:32 PM
compress ignite's Avatar
Drone aspiring to Serfdom
 
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
A/c

Whoops! I stand corrected.The Vacuum Diagnostic Block [ Y-7] is located
"Above the passenger Foot-well" according to the FSM


JOB Number 83-620 "Checking flap control vacuum system for leaks"

Yeah, you're low on refrigerant...Is the system on r-12 or r-134 ?
(In any case,a set of gauges and leak detector is the sensible way to
work on the A/C...Anything else is the old Pinata action.)
Attached Thumbnails
newbee here-screenhunter_02-jul.-18-15.24.gif  
__________________
'84 300SD sold
124.128
Reply With Quote
  #10  
Old 07-18-2008, 10:12 PM
Registered User
 
Join Date: Jul 2008
Posts: 25
whew...lotta lines to follow
going to buy a mityvac but really dont understand how to use it is or are there any links or advise
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 07:08 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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