Coolant level runs low only 2000km

2012ml550 · 05-14-2012, 02:50 PM

My new 2012 ml550 runs only 4700km and coolant low warning message has appeared twice, one around 2000 and one around 4500 and disappeared itself after a few minutes drive each time. I also noticed there are fresh water marks on the ground it was parked. Add coolant and suspect coolant leakage. Can't believe it happens to my new ml.

Booked appointment with dealer to have it checked this week.

Otherwise it is an awesome car though.

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YYZ-E55 · 05-15-2012, 01:19 PM

Possibly no cause for alarm. The water is probably from the AC condensor, and the low coolant light is likely going away because the fluid expands when it warms up. The coolant level simply may not have been filled enough from the factory.

2012ml550 · 05-15-2012, 01:52 PM

dealer topped the coolant level to the max when the warning message appeared for the first time. Then after around another 2000km, warning message appeared again. Visually checked the coolant level, it was really lower than the top. So I added coolant myself before sending it over to dealer to check the leakage. Not sure if the water is from AC but hope so. However some coolant was lost for sure in a short period of time.

katiesdad7 · 05-16-2012, 08:45 PM

Check the oil dipstick to see if coolant is in the oil.

300DTurbo · 05-16-2012, 09:55 PM

doesn't the 550 have a known HG issue?

2012ml550 · 05-17-2012, 08:58 AM

Here is an update from my dealer: they came back and didn't find any leakage after visual checking and pressure tester."RAISED VEHICHLE ON HOIST RE AND RE THE LOWER ENGINE COVERS NO LEAKS DETECTED AT THIS TIME. PRESSURIZED COOLANT TO 1.5BAR WHILE INSPECTING FOR LEAKS. NO LEAKS DETECTED AT THIS TIME. WITH PRESSURE TESTER CONNECTED FOR ABOUT 15MIN PRESSURE DID NOT DECREASE STAYED AT 1.5BAR".

2012ml550 · 05-17-2012, 09:00 AM

Quote:

Originally Posted by katiesdad7

Check the oil dipstick to see if coolant is in the oil.

KATIESDAD7, how to see coolant in oil? coolant is basically water..... thanks,

2012ml550 · 05-17-2012, 09:01 AM

Quote:

Originally Posted by 300DTurbo

doesn't the 550 have a known HG issue?

hi 300DTurbo, what is the HG issue? I am new here.... thanks

2012ml550 · 05-17-2012, 09:04 AM

Quote:

Originally Posted by 2012ml550

hi 300DTurbo, what is the HG issue? I am new here.... thanks

found answer myself. Head Gasket... thanks,

dgiturbo · 05-18-2012, 07:16 AM

Here is my guess. For some reason these turbocharged engines trap an air bubble somewhere in the system when factory filled, that slowly works its way back to the reservoir, causing the lower level and light.
My diesel ML did this exact same thing about 3 or 4 times within the first 6 months, usually after I parked and the night got cold. Never since. Back then I just topped it up with about half a cup of coolant each time.
If MB pressure tested and it held, and you are not having overheating issues, your good to go.
And like YYZ-E55 said, the water you are seeing is probably going to be from the air conditioning. Touch it and see if it feels "oily" (coolant) or it's just water.

2012ml550 · 05-18-2012, 10:38 AM

Thanks dgiturbo! you gives me a peace of mind of such instance.....maybe just water came out from A/C and never have overheating.

Thanks and I love the forum from my heart.

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05-15-2012, 01:19 PM	#2
YYZ-E55 MBWorld Fanatic! Garage is empty, add now Join Date: Mar 2005 Location: Toronto Posts: 1,598 Drives: MY13 ML350 Tenorite/designo Porcelain, MY14 E350 Estate Black/Porcelain	Possibly no cause for alarm. The water is probably from the AC condensor, and the low coolant light is likely going away because the fluid expands when it warms up. The coolant level simply may not have been filled enough from the factory.

05-15-2012, 01:52 PM	#3
2012ml550 Newbie Garage is empty, add now Join Date: May 2012 Location: Toronto Posts: 10 Drives: 2012 ml550	dealer topped the coolant level to the max when the warning message appeared for the first time. Then after around another 2000km, warning message appeared again. Visually checked the coolant level, it was really lower than the top. So I added coolant myself before sending it over to dealer to check the leakage. Not sure if the water is from AC but hope so. However some coolant was lost for sure in a short period of time.

05-16-2012, 08:45 PM	#4
katiesdad7 Senior Member Garage is empty, add now Join Date: Oct 2011 Posts: 348 Drives: 2012 ML 350 BlueTec	Check the oil dipstick to see if coolant is in the oil.

05-16-2012, 09:55 PM	#5
300DTurbo Senior Member 1984 Mercedes-Benz 300-Class Join Date: Nov 2011 Posts: 317 Drives: 300D Turbo 1984	doesn't the 550 have a known HG issue?

05-17-2012, 08:58 AM	#6
2012ml550 Newbie Garage is empty, add now Join Date: May 2012 Location: Toronto Posts: 10 Drives: 2012 ml550	Here is an update from my dealer: they came back and didn't find any leakage after visual checking and pressure tester."RAISED VEHICHLE ON HOIST RE AND RE THE LOWER ENGINE COVERS NO LEAKS DETECTED AT THIS TIME. PRESSURIZED COOLANT TO 1.5BAR WHILE INSPECTING FOR LEAKS. NO LEAKS DETECTED AT THIS TIME. WITH PRESSURE TESTER CONNECTED FOR ABOUT 15MIN PRESSURE DID NOT DECREASE STAYED AT 1.5BAR".

05-18-2012, 07:16 AM	#10
dgiturbo Super Member Garage is empty, add now Join Date: Dec 2007 Location: Woodstock, IL Posts: 825 Drives: His 2007 ML320 CDI P3; Hers 2012 GLK 350 4Matic P1 Lighting Sports; Kids 2010 "4Matic" Impreza	Here is my guess. For some reason these turbocharged engines trap an air bubble somewhere in the system when factory filled, that slowly works its way back to the reservoir, causing the lower level and light. My diesel ML did this exact same thing about 3 or 4 times within the first 6 months, usually after I parked and the night got cold. Never since. Back then I just topped it up with about half a cup of coolant each time. If MB pressure tested and it held, and you are not having overheating issues, your good to go. And like YYZ-E55 said, the water you are seeing is probably going to be from the air conditioning. Touch it and see if it feels "oily" (coolant) or it's just water.

05-18-2012, 10:38 AM	#11
2012ml550 Newbie Garage is empty, add now Join Date: May 2012 Location: Toronto Posts: 10 Drives: 2012 ml550	Thanks dgiturbo! you gives me a peace of mind of such instance.....maybe just water came out from A/C and never have overheating. Thanks and I love the forum from my heart.

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