Losing coolant - S550 2014
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E350
Losing coolant - S550 2014
I'm hoping this is the correct forum for my issue.
I own a 2014 S550 Edition 1 with 90,000 miles. Recently, I've been getting a low coolant level warning on the dashboard roughly once a week, even if I drive less than 50 miles. On one occasion, the temperature gauge read 200°F, whereas it normally reads 190°F.
After I top off the coolant, the warning disappears until the following week. There are no signs of coolant leakage on my driveway. The car seems to run well without any smoke or power loss.
My mechanic suggests it could be the head gaskets. Shouldn't there be visible smoke or steam from the exhaust if that's the case? What else might be the problem?
Additionally, the fan starts at full speed in the early morning when I just open the door. When the engine is off but still warm, the fan runs for 10-15 seconds every five minutes until it stops about an hour later.
Thank you.
I own a 2014 S550 Edition 1 with 90,000 miles. Recently, I've been getting a low coolant level warning on the dashboard roughly once a week, even if I drive less than 50 miles. On one occasion, the temperature gauge read 200°F, whereas it normally reads 190°F.
After I top off the coolant, the warning disappears until the following week. There are no signs of coolant leakage on my driveway. The car seems to run well without any smoke or power loss.
My mechanic suggests it could be the head gaskets. Shouldn't there be visible smoke or steam from the exhaust if that's the case? What else might be the problem?
Additionally, the fan starts at full speed in the early morning when I just open the door. When the engine is off but still warm, the fan runs for 10-15 seconds every five minutes until it stops about an hour later.
Thank you.
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Joined: Nov 2014
Posts: 4,242
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From: Chicago burbs
2015 S550
I'm hoping this is the correct forum for my issue.
I own a 2014 S550 Edition 1 with 90,000 miles. Recently, I've been getting a low coolant level warning on the dashboard roughly once a week, even if I drive less than 50 miles. On one occasion, the temperature gauge read 200°F, whereas it normally reads 190°F.
After I top off the coolant, the warning disappears until the following week. There are no signs of coolant leakage on my driveway. The car seems to run well without any smoke or power loss.
My mechanic suggests it could be the head gaskets. Shouldn't there be visible smoke or steam from the exhaust if that's the case? What else might be the problem?
Additionally, the fan starts at full speed in the early morning when I just open the door. When the engine is off but still warm, the fan runs for 10-15 seconds every five minutes until it stops about an hour later.
Thank you.
I own a 2014 S550 Edition 1 with 90,000 miles. Recently, I've been getting a low coolant level warning on the dashboard roughly once a week, even if I drive less than 50 miles. On one occasion, the temperature gauge read 200°F, whereas it normally reads 190°F.
After I top off the coolant, the warning disappears until the following week. There are no signs of coolant leakage on my driveway. The car seems to run well without any smoke or power loss.
My mechanic suggests it could be the head gaskets. Shouldn't there be visible smoke or steam from the exhaust if that's the case? What else might be the problem?
Additionally, the fan starts at full speed in the early morning when I just open the door. When the engine is off but still warm, the fan runs for 10-15 seconds every five minutes until it stops about an hour later.
Thank you.
Thread Starter
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E350
My old 2013 GL550 used to occasionally get the low coolant warning, at which point I would top it off and it was fine for a while. If you haven't done it in the last 30k miles, you may want to consider having a full coolant flush done with a new thermostat. That may fix the issue. BTW, my car always hits 200 degrees when it's fully warmed up and pretty much stays right there until I shut it down.
Thanks for your reply.
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From: Florida
18 AMG GTC and 22 F150 Limited. Past owner 16 Maybach, 17 Brabus Smartcar, 06 Ford E150, and 22 G70
Did you check your oil to see if its milky? Your engine might have a water to oil cooler that is leaking water into the oil. Here is a picture example of what these coolers look like. http://shop.advanceautoparts.com/p/d...E&gclsrc=aw.ds
Its been a while BUT if i recall one way to test for a leak is to borrow a coolant pressure tester at the auto parts store. Add pressure to the coolant system and see if it holds.
Katie
Its been a while BUT if i recall one way to test for a leak is to borrow a coolant pressure tester at the auto parts store. Add pressure to the coolant system and see if it holds.
Katie
Last edited by Katie22; Aug 6, 2024 at 04:39 PM.
Thread Starter
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E350
Did you check your oil to see if its milky? Your engine might have a water to oil cooler that is leaking water into the oil. Here is a picture example of what these coolers look like. http://shop.advanceautoparts.com/p/d...E&gclsrc=aw.ds
Its been a while BUT if i recall one way to test for a leak is to borrow a coolant pressure tester at the auto parts store. Add pressure to the coolant system and see if it holds.
Katie
Its been a while BUT if i recall one way to test for a leak is to borrow a coolant pressure tester at the auto parts store. Add pressure to the coolant system and see if it holds.
Katie
MBWorld Fanatic!
Joined: Mar 2018
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From: Florida
18 AMG GTC and 22 F150 Limited. Past owner 16 Maybach, 17 Brabus Smartcar, 06 Ford E150, and 22 G70
Yes the link was supposed to show an example of an oil cooler you would find similar on you engine,
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Posts: 1,173
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S600
I had a similar problem over the last year.
It turns out that, in MB great desire for luxury everything, that they designed a coolant line into the windshield washer reservoir (WWR), and than nine had "gone bad".
So, take a look at the WWR, and at the oil, too. If you see a color other than WW fluid, suspect that warming line has "decayed"
It turns out that, in MB great desire for luxury everything, that they designed a coolant line into the windshield washer reservoir (WWR), and than nine had "gone bad".
So, take a look at the WWR, and at the oil, too. If you see a color other than WW fluid, suspect that warming line has "decayed"
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E350
I had a similar problem over the last year.
It turns out that, in MB great desire for luxury everything, that they designed a coolant line into the windshield washer reservoir (WWR), and than nine had "gone bad".
So, take a look at the WWR, and at the oil, too. If you see a color other than WW fluid, suspect that warming line has "decayed"
It turns out that, in MB great desire for luxury everything, that they designed a coolant line into the windshield washer reservoir (WWR), and than nine had "gone bad".
So, take a look at the WWR, and at the oil, too. If you see a color other than WW fluid, suspect that warming line has "decayed"
MBWorld Fanatic!
Joined: Nov 2014
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From: Chicago burbs
2015 S550
It's not the same as the windshield washer fluid. Our wipers have the wiper fluid come directly out of the wiper blades through the tiny holes. In the winter, those could plug up. Having a heater line going through the washer pump helps ensure that the holes won't clog with icy fluid.
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2016 S550
Thread Starter
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E350
The coolant is green and the windshield fluid is also light green, hard to say if they are mixing, maybe I use red windshield washer fluid and check.
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