Octaviamk3

Hi Yes, replaced the EGR cooler and its all good now.

Egr cooler, inlet cooler?

Is yours leaking from the overflow of the expansion tank? Yes it has, its not loosing it via the water pump, the expansion tank is over pressuring, skoda just think its the radiator though, well suspect, nothing to do with the tank over pressurising apparently

Evening guys, Got an issue with my 2016 Octavia, 184 Diesel. 131k. I've been loosing coolant recently, around 0.5L every couple of hundred miles. Changed the cap, no signs of leaks. I put some paper under the overflow/overpressure relief of the expansion tank and it did have a wet spot after a drive out. As it seems the tank is over pressuring and relieving, all I can think of is the head gasket has gone. The coolant is still a redish colour, no mayo under the oil cap. With the cap off the expansion tank, the level doesn't rise and fall when the engine is running, or bubble. Before I go to a garage, is there anything else it could be, a search doesn't really bring up any answers online. Thanks in advance.