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 06-11-2002, 05:41 PM
Registered User
Join Date: Jan 2002
Posts: 352
M119 Radiator Overheating

I have a 99 s420 with 45k miles. I thought my overheating problem was due to the cats but I replaced everything from the cats to the rear muffler and 02 sensors but still I am staying at around 100C (MOSTLY ON HIGHWAY). I have had my coolant changed at the dealer, so I think it is not my coolant/H20 ratio. The dealer performed a roar test twice and reported it stayed at 84C. Also I have had my oil pump switched out too. With my generous warranty dwindling to an end, I was wondering if my radiator is the culprit. Please post on what should I do?

Also on my 97 E320 rear door, there is some crackling noise once I it is moved and it doesnt slam good. Is the problem my door check straps.
Reply With Quote
Old 06-11-2002, 07:06 PM
Registered User
Join Date: Apr 1999
Posts: 2,632
Have you replaced your radiator and thermostat?

:-) neil
1993 500E (M119 engine)
Reply With Quote
Old 06-11-2002, 08:56 PM
Registered User
Join Date: Jan 2002
Posts: 352
not yet.
Reply With Quote
Old 06-13-2002, 03:43 AM
Registered User
Join Date: Jan 2002
Posts: 352
so should I go try to make the dealer replace the radiator. What is a roar test
Reply With Quote
Old 06-14-2002, 08:35 PM
JimF's Avatar
'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,924
Are you sure that anyhting is really wrong?

At highway speeds with 80F temp and 80% RH using A/C, staying around 95-100C is not bad!

Check the coolant ratio for yourself and make sure it's no more than 50/50, preferably 40/60 (af/water) ratio.

If you think something is still wrong, check the thermostat!

Wonder what a roar test is? ROAD???
Regards . . . . JimF
'94 S500 Cpe

Visit my Mercedes Web Page
Reply With Quote
Old 06-14-2002, 09:19 PM
Registered User
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
I would second JimF's comments. My M119 engine runs 90-100 degrees with ambient temp >80, at highway speeds. This is despite having Water Wetter, a new water pump, radiator, and thermostat, so I am PRETTY SURE the system is functioning as efficiently as it can ...
'93 400E
Reply With Quote
Old 06-14-2002, 11:03 PM
Registered User
Join Date: Apr 1999
Posts: 2,632
The "roar" test is also known as the viscous fan test.

Based upon temperature and RPMs, the viscous fan is suppose to engage at x-degrees and y-RPM, and disengage at z-RPM.

Viscous-Fan coupling airflow temp: 92-100C
Safety Cut-off Fan Speed: 4500, engine RPM 3250

Also, it's called a "roar" test because if it's hot outside and in the engine-bay, once you hit about 3500 RPM the viscous fan should be engaged and you'll hear the "roar" of the fan.

:-) neil
1988 360TE AMG
1993 500E

Last edited by ke6dcj; 06-14-2002 at 11:10 PM.
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

All times are GMT -4. The time now is 12:01 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