W218 CLS63S - coolant issue
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CLS 63 S AMG 4 MATIC
W218 CLS63S - coolant issue
Hi Guys,
SO recently iv encountered a problem with the coolant system on my car, below is a brief history of what has happened.
Any advice would be really appreciative as i love the car and i've driven almost 130,000km on it taking great care.
SO recently iv encountered a problem with the coolant system on my car, below is a brief history of what has happened.
- I was driving on sports + and the coolant system had exploded so i pulled over and turned the car off immediately.
- The garage ive been taking it to for over 4 years diagnosed the problem as a leaking reservoir and leaking coolant hose which they replaced.
- I then received the car but this is where the problem arises.
- When running the car and the engine gets to temp the coolant goes all the way down triggering the check coolant warning.
- I then slowly turn the reservoir cap which then cause the coolant to come rushing back up to the point of initial filling.
Any advice would be really appreciative as i love the car and i've driven almost 130,000km on it taking great care.
Last edited by cls63sdxb; Mar 1, 2024 at 08:52 AM.
Out Of Control!!
Joined: Apr 2019
Posts: 12,279
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
IMPROPER FILL PROCEDURE
coolant goes away then comes back up.... there is an air pocket in your cooling system: engine or radiator.
Use the vacuum refill method.
RTFM : do not open system at operating temperature... 200F degree burning hazard!
Use the vacuum refill method.
RTFM : do not open system at operating temperature... 200F degree burning hazard!
Last edited by CaliBenzDriver; Jul 28, 2025 at 02:55 PM.
