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Old 06-11-2002, 05:41 PM
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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.
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Old 06-11-2002, 07:06 PM
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Have you replaced your radiator and thermostat?

:-) neil
1993 500E (M119 engine)
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Old 06-11-2002, 08:56 PM
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not yet.
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Old 06-13-2002, 03:43 AM
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Posts: 352
so should I go try to make the dealer replace the radiator. What is a roar test
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Old 06-14-2002, 08:35 PM
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'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,929
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
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Old 06-14-2002, 09:19 PM
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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
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Old 06-14-2002, 11:03 PM
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Posts: 2,633
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.
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