WalkOnThePlank

Greetings everyone I need your assistance with an issue I'm facing with my car, E55 AMG W211 lates 2005. I've noticed that it's losing coolant, but I can't pinpoint the exact source of the leak.When the car's temperature is high and I open the reservoir cap, I notice that the coolant doesn't rise or requires significant force to do so.Reservoir cap is changed with a new one too.

Specifically, it requires approximately one liter of coolant every 1000 kilometers. I've checked the engine oil, and there doesn't seem to be any abnormality. The exhaust isn't emitting white smoke or water either. Additionally, I can't find any visible leaks in the engine compartment.

I assume you might not discern any problem from this information, but I would appreciate any ideas or advice on how to identify this coolant leak. Thank you in advance for your support!

nd-photo.nl

Do a pressure test to inspect where the coolant is going. Also, dont open the reservoir cap when the coolant is hot

WalkOnThePlank

Thank you,I’m gonna try that.
Yea I know it’s dangerous but I wanted to see why the coolant didn’t raise or why it didn’t had any pressure.

nd-photo.nl

As you might know, the cooling system works under pressure, so its vital you get to the bottom of this! Good luck in hunting it down

SICAMG

Also it is sometimes best to do the pressure test after the engine is warmed up. Head gasket issues normally manifest themselves when the engine gets warm/hot and everything has expanded.

nd-photo.nl

I didnt know that, thanks for the insight!