350SDL Engine Temperature

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350SDL Engine Temperature

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Mercedes >> Mercedes Benz Models >> Diesel Discussions >> 350SDL Engine Temperature

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350SDL Engine Temperature - 7/3/2005 9:26:17 PM

mbenzer

Posts: 25
Joined: 4/18/2005
Status: offline

It's summer in Texas bouncing off 100F but I don't remember my 350SDL's engine temperature gage moving around a lot between 90C and 110C. At one point during
a long haul up a hill at 70 mph, it stopped just short of 120C ! The radiator and
thermostat were replaced within the past 6 mos. and coolant is at proper level. Could
it be the dual fans or something more ominous? This unit has 126K miles and does not
use any oil (yet) and I am aware of the potential for a short life span. Still a great road
car !

< Message edited by mbenzer -- 7/4/2005 7:02:29 PM >

Post #: 1

RE: 350SDL Engine Temperature - 7/5/2005 8:10:22 PM

Benzbob

Posts: 151
Joined: 2/25/2005
Status: offline

The auxiliary fan should come on at 105c. Check auxiliary fan motor, and thermo switch that activates it.

_____________________________

87 300 D

(in reply to mbenzer)

Post #: 2

RE: 350SDL Engine Temperature - 7/5/2005 9:29:40 PM

mbenzer

Posts: 25
Joined: 4/18/2005
Status: offline

Thanks for the advice as it's obviously pointing in that direction as I pulled the car over yesterday once the temp gage hit 100C at 70 mph (it stays around 90C at 60 mph), popped
the hood to find only one of the dual fans working. Once the car is stopped, the temp. increases about 5 degrees due to the lack of air flow I'm assuming.

(in reply to mbenzer)

Post #: 3

RE: 350SDL Engine Temperature - 7/8/2005 4:02:20 PM

Benzbob

Posts: 151
Joined: 2/25/2005
Status: offline

Yes, it is normal for the engine to rise in temperature after exiting a highway etc, but should cool back down within a few minutes of 30 mph driving.

(in reply to mbenzer)

Post #: 4

RE: 350SDL Engine Temperature - 7/13/2005 8:20:43 PM

rdolberry

Posts: 9
Joined: 7/13/2005
Status: offline

You could possibly have a radiator partly stopped up due to electrolices breaking down the aluminium heads. They make radiator additive used to help this from happening.

(in reply to Benzbob)

Post #: 5

RE: 350SDL Engine Temperature - 7/13/2005 8:22:56 PM

rdolberry

Posts: 9
Joined: 7/13/2005
Status: offline

Do not run that engine hot there bad about blowing head gasket.

(in reply to rdolberry)

Post #: 6