Loosing Coolant

[ALFIrE]

Hey guys,
I have An 2018 T6 204 bhp.

Last Saturday warning light - Coolant low. Checked and indeed well below minimum mark.

Topped up, and I can see it slowly goes down...

Took off the plastic under engine, put pressure on reservoir , no leaks to be seen!

Oil level is stable, no white smoke.

Does this leave the EGR cooler as suspect?

We're about to start our holiday, probably 5000km...

 

[RobertO2023]

I’d say get it attended to before you embark on long trip.
Various tests
Get around the engine with a good torch, sometimes a small leak is overlooked especially around the water pump area.
Any damp inside under the heater ?
Do a calibrated pressure test - expansion tank noting rate of pressure change
Is there any retained pressure when the engine is cold?
If so do a block test to check for hydrocarbons
You mentioned oil is clear and no white smoke therefore unlikely to be a split in the EGR cooler - you could bypass the cooler by temporarily removing the coolant hoses and blanking them. Static test don’t run the Engine! That would confirm or eliminate the EGR cooler issue
Have you got rear heating? Check Pipework under the length of the vehicle
I hope you get sorted before your hols

 

[Chugga90]

Had coolant loss on my 2017 204.
It was a pin holed hose on the right of the engine bay when viewing from the front.
Took ages to find, but got it eventually