Coolant Temp
Thread Starter
Member
Joined: Sep 2012
Posts: 200
Likes: 10
2024 GLS450, Previously 2020 GLS450, 2017 GLS450, 2014 GL450, 2012 GL450
Coolant Temp
Quick question, since I got the car the coolant temperature on the car seemed abnormally high, but I ignored it as I thought it was normal. However, since then I've driven many many cars, and all don't go higher than half of the gauge.
On my GL, I'm always at close to 100 degrees, although other cars' gauge don't tell you temperature, but is this normal? I wanted to ask you guys before taking it to the dealership.
On my GL, I'm always at close to 100 degrees, although other cars' gauge don't tell you temperature, but is this normal? I wanted to ask you guys before taking it to the dealership.
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Newbie
Joined: Dec 2021
Posts: 2
Likes: 0
Mercedes-Benz GL 450 4matic
engineer
My car GL 450 4MATIC was over heating to about 110 degrees.C which I feel was too high,having been used to Japanese cars with max cooling water temperature at 60-70 deg.C.
I therefore adapted another fan to the radiator in place of the original fan because i couldn't source the defective module attached to the fan.This was about two months ago.Thereafter,I noticed high cooling water temperature up to 110deg.C
I was made to change the thermostat.There after,I began to hear a thumping sound in the cooling water system.This happens when its like the thermostat is making a tapping noise and you could see the bubbles returning to the transparent plastic expansion tank! Although,the cooling effect on the AC system seems normal.
The original fan with the module was re installed,but the thumping noise is persistent with engine now running at 99deg.C.
How can I reduce the cooling temperature to about 85-90deg.C and stop the thumping noise in the fooling system. LOOKS LIKE THE RATTLING OF THE THERMOSTAT IS CAUSING THE BUBBLES IN THE WATER TO RETURN TO THE EXPANSION TANK.
I therefore adapted another fan to the radiator in place of the original fan because i couldn't source the defective module attached to the fan.This was about two months ago.Thereafter,I noticed high cooling water temperature up to 110deg.C
I was made to change the thermostat.There after,I began to hear a thumping sound in the cooling water system.This happens when its like the thermostat is making a tapping noise and you could see the bubbles returning to the transparent plastic expansion tank! Although,the cooling effect on the AC system seems normal.
The original fan with the module was re installed,but the thumping noise is persistent with engine now running at 99deg.C.
How can I reduce the cooling temperature to about 85-90deg.C and stop the thumping noise in the fooling system. LOOKS LIKE THE RATTLING OF THE THERMOSTAT IS CAUSING THE BUBBLES IN THE WATER TO RETURN TO THE EXPANSION TANK.
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Newbie
Joined: Dec 2021
Posts: 2
Likes: 0
Mercedes-Benz GL 450 4matic
Engr Israel Obadan
My GL 450 4matic operates with cooling water temperature at 110deg.C.I feel this is too high.
Moreover it developed a thumbing noise in the cooling water system.Looks like the thermostat brings a tapping noise inside the cooling line.I have changed the radiator to new. The thermostat was changed to new also.The thumbing noise developed after thermostat was changed. During the thumbing noise,you can see bubbles retu to the transparent expansion tk.What can I do to stop the high temperature and thumbing in the cooling kine?
Moreover it developed a thumbing noise in the cooling water system.Looks like the thermostat brings a tapping noise inside the cooling line.I have changed the radiator to new. The thermostat was changed to new also.The thumbing noise developed after thermostat was changed. During the thumbing noise,you can see bubbles retu to the transparent expansion tk.What can I do to stop the high temperature and thumbing in the cooling kine?
Super Member
Joined: Jul 2019
Posts: 733
Likes: 297
From: New Orleans
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
110 degrees Celsius mean you are overheating engine. Normal temperature suppose to be around 90. Sound you hear is a coolant boiling in system. Could be number of things.
1) Thermostat - probably not the cause since you changed it
2) Fan - is it working? Do you hear it engage?
3) Least probable - coolant pump (since it is mechanical)
4) Coolant reservoir cap - yes, some of those won't keep the pressure needed for proper functioning.
1) Thermostat - probably not the cause since you changed it
2) Fan - is it working? Do you hear it engage?
3) Least probable - coolant pump (since it is mechanical)
4) Coolant reservoir cap - yes, some of those won't keep the pressure needed for proper functioning.
MBWorld Fanatic!
Joined: Jan 2014
Posts: 1,053
Likes: 355
From: USA - Minnesota
2014 GL350
110 degrees Celsius mean you are overheating engine. Normal temperature suppose to be around 90. Sound you hear is a coolant boiling in system. Could be number of things.
1) Thermostat - probably not the cause since you changed it
2) Fan - is it working? Do you hear it engage?
3) Least probable - coolant pump (since it is mechanical)
4) Coolant reservoir cap - yes, some of those won't keep the pressure needed for proper functioning.
1) Thermostat - probably not the cause since you changed it
2) Fan - is it working? Do you hear it engage?
3) Least probable - coolant pump (since it is mechanical)
4) Coolant reservoir cap - yes, some of those won't keep the pressure needed for proper functioning.
Senior Member
Joined: Apr 2023
Posts: 314
Likes: 34
Mercedes gl450
110 degrees Celsius mean you are overheating engine. Normal temperature suppose to be around 90. Sound you hear is a coolant boiling in system. Could be number of things.
1) Thermostat - probably not the cause since you changed it
2) Fan - is it working? Do you hear it engage?
3) Least probable - coolant pump (since it is mechanical)
4) Coolant reservoir cap - yes, some of those won't keep the pressure needed for proper functioning.
1) Thermostat - probably not the cause since you changed it
2) Fan - is it working? Do you hear it engage?
3) Least probable - coolant pump (since it is mechanical)
4) Coolant reservoir cap - yes, some of those won't keep the pressure needed for proper functioning.
Senior Member
Joined: Jun 2010
Posts: 465
Likes: 120
2022 SL 55 AMG, 2020 AMG GT 53, 2015 GL 550
Same! I have a GL550 and that was the first thing I noticed. But never had an issue, never overheated. Coolant and radiator are all good. I guess it's just a MB GL thing.
Senior Member
Joined: Apr 2023
Posts: 314
Likes: 34
Mercedes gl450
My GL 450 4matic operates with cooling water temperature at 110deg.C.I feel this is too high.
Moreover it developed a thumbing noise in the cooling water system.Looks like the thermostat brings a tapping noise inside the cooling line.I have changed the radiator to new. The thermostat was changed to new also.The thumbing noise developed after thermostat was changed. During the thumbing noise,you can see bubbles retu to the transparent expansion tk.What can I do to stop the high temperature and thumbing in the cooling kine?
Moreover it developed a thumbing noise in the cooling water system.Looks like the thermostat brings a tapping noise inside the cooling line.I have changed the radiator to new. The thermostat was changed to new also.The thumbing noise developed after thermostat was changed. During the thumbing noise,you can see bubbles retu to the transparent expansion tk.What can I do to stop the high temperature and thumbing in the cooling kine?
