Coolant Fluid Low
Thread Starter
Junior Member
Joined: Mar 2020
Posts: 59
Likes: 6
2018 GLC 63
Coolant Fluid Low
So I got a message that the coolant fluid was low, so I checked and it is low. Obviously I can add more, but I am curious to why it is low. Any ideas? I bought the car about 6 weeks ago used, with 11K miles on it (18' GLC 63). I had the oil changed a few weeks ago (not at a MB dealership) and they didn't say anything was off. Should I take it in or just add fluid? I don't know as much about engines as a lot of you do. Thanks.
Out Of Control!!
Joined: Sep 2018
Posts: 14,666
Likes: 4,568
From: unbegrenzt
2017 GLE350 4MATIC
Coolant level decreases by:
- evaporation out of the reservoir (unlikely)
- internal leak and consumption (eg head gasket)
- external leak (eg leaking hose, radiator or pump)
Take the vehicle to a dealer or do a very thorough inspection yourself to narrow down the potential causes.
First things first - is the reservoir cap on tight?
- evaporation out of the reservoir (unlikely)
- internal leak and consumption (eg head gasket)
- external leak (eg leaking hose, radiator or pump)
Take the vehicle to a dealer or do a very thorough inspection yourself to narrow down the potential causes.
First things first - is the reservoir cap on tight?
Thread Starter
Junior Member
Joined: Mar 2020
Posts: 59
Likes: 6
2018 GLC 63
Coolant level decreases by:
- evaporation out of the reservoir (unlikely)
- internal leak and consumption (eg head gasket)
- external leak (eg leaking hose, radiator or pump)
Take the vehicle to a dealer or do a very thorough inspection yourself to narrow down the potential causes.
First things first - is the reservoir cap on tight?
- evaporation out of the reservoir (unlikely)
- internal leak and consumption (eg head gasket)
- external leak (eg leaking hose, radiator or pump)
Take the vehicle to a dealer or do a very thorough inspection yourself to narrow down the potential causes.
First things first - is the reservoir cap on tight?
Super Member
Joined: Oct 2008
Posts: 519
Likes: 50
From: Mississauga
GLA45 AMG, GLC43 AMG
Top it up, and keep an eye on it, if it goes down again, take it in to a qualified shop or dealer, as mentioned above this typically is not normal, but can happen, I believe like on BMW vehicles it’s a closed system, it should not be leaking anywhere and or evaporating, but after 2 years, there just might be a slight chance.
You could also go to dealer and have the coolant flushed and replaced and set to correct level, and see what happens, coolant can be changed, and at times is recommended it’s in the manual.
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You could also go to dealer and have the coolant flushed and replaced and set to correct level, and see what happens, coolant can be changed, and at times is recommended it’s in the manual.
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Last edited by GateKeeper; Oct 7, 2020 at 06:24 PM.
