2015 GL350 BlueTEC - Engine Temperature
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 21
Likes: 1
From: Greater Toronto Area, Ontario, Canada
2015 Mercedes Benz GL350 BlueTEC
2015 GL350 BlueTEC - Engine Temperature
Wondering if anyone has ever noticed the temperature needle in their Diesel engine Benz. I’m assuming it drives hotter than gasoline engines but how much hotter?
I recently noticed mine was running at around 10 while city driving. Since it only goes upto about 15, I thought it was too hot. Any ideas?
I’ll keep monitoring and try to post pictures.
I recently noticed mine was running at around 10 while city driving. Since it only goes upto about 15, I thought it was too hot. Any ideas?
I’ll keep monitoring and try to post pictures.
Last edited by Choliya; Oct 13, 2019 at 01:19 PM.
MBWorld Fanatic!
Joined: Jan 2014
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From: USA - Minnesota
2014 GL350 / 2026 BMW iX iDrive60
If you are seeing wild changes in temp once the engine is warm, or extremes (hot or cold), then that could indicate an issue that requires more troubleshooting.
p.s. my USA-spec GL350 temp gauge is in Celsius and the engine is usually regulated around 90C. (The engine is still cold in the attached photo.)
Last edited by cadetdrivr; Oct 13, 2019 at 11:49 AM.
Thread Starter
Junior Member
Joined: Aug 2019
Posts: 21
Likes: 1
From: Greater Toronto Area, Ontario, Canada
2015 Mercedes Benz GL350 BlueTEC
As long as the temp is stable, and not at the redline you are fine---there's a thermostat that regulates the cooling system to maintain a constant optimum temperature.
If you are seeing wild changes in temp once the engine is warm, or extremes (hot or cold), then that could indicate an issue that requires more troubleshooting.
p.s. my USA-spec GL350 temp gauge is in Celsius and the engine is usually regulated around 90C. (The engine is still cold in the attached photo.)
If you are seeing wild changes in temp once the engine is warm, or extremes (hot or cold), then that could indicate an issue that requires more troubleshooting.
p.s. my USA-spec GL350 temp gauge is in Celsius and the engine is usually regulated around 90C. (The engine is still cold in the attached photo.)
I was initially worried because I thought most auto manufacturers design the temperature gauge so that the engine operates at around the middle, which would be 80 in this case. When I saw it go past the halfway point I was starting to worry but I guess it’s normal.
Out Of Control!!
Joined: Sep 2018
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From: unbegrenzt
2017 GLE350 4MATIC
Normal. M-B has a different approach to user interface compared with other carmakers, examples include the temperature gage noted above, and the HVAC fan settings. Very different experience, depending on what brand is being compared vs. M-B.
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Joined: Jul 2019
Posts: 735
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From: New Orleans
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
Standard thermostat keep engine at about 89-91 degrees. That is normal working temp.
Under heavy load it can go 95-100 - by heavy i mean all the way to the floor.
Under heavy load it can go 95-100 - by heavy i mean all the way to the floor.
