Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 11-21-2000, 03:42 PM
Registered User
Join Date: Nov 2000
Location: Dushore, PA, USA
Posts: 18
Greetings from a 1st time site user!

I have an '83 300TDT.... runs reasonably well @ 270k miles w/ most maintenance current. Located in mountains 50 miles from nearest foreign auto tech, much less dealership.

Have been plagued w/ the usual plethora of vacuum system leaks (door cells, rubber connections, etc.). Recently I've had trouble w/ engine still running (albeit roughly) after ignition turned off. Shuts off fine manually. Later, developed prob w/ climate control... on econo position,heat only comes out of defroster & dash vents. Found several leaky rubber connectors on vacuum lines in engine compartment & replaced them. Door locks & cruise control work OK, too. Unfortunately, my aftermarket service manual doesn't have a schematic on either the vacuum system or climate control.

My questionS.... 1) are the servos that operate the heater/defroster baffles electrically or vacuum controlled? 2)Basically, am I likely to have more vacuum leaks inside, under dash, or a bad climate control? 3) Is vacuum source only off of manifold or is there a pump, too?

Many thanks in advance for comments.

Bruce Body
Reply With Quote
Old 11-21-2000, 09:00 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Most of it is vacuum. You have an electronic control unit that sends electric signals to a vacuum block that opens and closes the doors in the heater box. I would think that you have a fault in the vacuum system. I would test the VOLUME of vacuum coming from the booster hose. I have seen the line clog up from time to time (hint)>

Donnie Drummonds
Reply With Quote
Old 11-22-2000, 08:22 AM
Registered User
Join Date: Nov 2000
Location: Dushore, PA, USA
Posts: 18
Thanks, Donnie, for the prompt response. I'll check the line today.

Where is the vacuum control found? Is it actually located inside the heater box & is it accessible?

Reply With Quote
Old 12-28-2000, 04:20 PM
Registered User
Join Date: Dec 2000
Posts: 17
Heater Air Problems

My '87 300TDT has blower air problems also. On any heating setting, including econo, there is only air coming from defrost vents and dash.

I'm hoping BWBody found something wrong with his vehicle. Any comments would be appreciated.
1987 300TDT 165K MILES
Reply With Quote
Old 12-28-2000, 04:58 PM
cth350's Avatar
Registered User
Join Date: Dec 2000
Location: Long Island, NY
Posts: 3,651
You most definitely want the factory service manuals for this (or any) car. Benz (and also the partsShop) sell a CD set with all the manuals on it. Also you can find it on ebay fairly often.

If you prefer paper manuals, they too are available from the same sources. There are several: 2 volume chassis manuals, engine manual (specific to your engine), climate control, electrical troubleshooting and transmission service. The tranny book is the only one NOT on the CDs.

There are 10 CDs available for the 107, 114, 115, 123, 124, 126 & 201 chassis (some are pairs). There are 10 CDs available for the 90s (current) models, but they are not detailed service discs, they just have technical training material.

What was the question again? Oh, yeah. You need the vacuum circuit. It's in the books (or the CD).

Reply With Quote
Old 12-28-2000, 08:34 PM
Posts: n/a
Don't forget the 116! We are a rare and special breed.
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
engine stop and climate control vacuum?? moruzzi Diesel Discussion 2 01-16-2005 09:55 PM
Does anyone know how to fix climate control vacuum motors? Mercedes Man Tech Help 2 07-20-2003 10:24 PM
W124 Climate Control Mystery djankov Diesel Discussion 2 11-04-2002 10:10 PM
Climate control unit '88 260E robbysf Tech Help 1 09-16-2002 12:39 PM
Climate control Problems...Need help Maddog Tech Help 8 07-17-2002 05:29 PM

All times are GMT -4. The time now is 10:29 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page