Citroen ds4 1.6 litre turbo engine

[Emer]

Team how are you I have a challenge am facing on my Citroën ds4 ep6 engine turbo it's start mixing oil and coalnt I take out both block and head cylinder to engineers and they say it needs light skim on both get it skimmed, i order a new gasket and thermostat rebuild the engine but m still facing a very same thing still overheating makes coalant pipes hard ,pressurizing in cooling system and jets out at coalant cap what really could be the reason kindly assist

[mickthemaverick]

If the engine has a coolant powered oil cooler then it may well be your problem, however the car is too new for me so I cannot offer any advice. Good luck

[PaulC5]

Is the engine fan running when it gets hot ?

[Emer]

Yes fan is running boss

[PaulC5]

Possibilities could include
- a water pump fault so it is not circulating the coolant. Was it replaced when you fit the cylinder head back ? A search suggests water pump faults are common on the EP6 engine. Try your own search on 'EP6 engine water pump fault'. This could have been the original problem that caused the head gasket to fail and possibly the cylinder head to warp if it overheated.
- the new head gasket is leaking. You could use a coolant exhaust gas tester (combustion leak tester), they do not cost much.
- the radiator is blocked so the coolant is not being cooled. See if its top and bottom hoses are the same temperature - the bottom one should be a lot cooler than the top one.
- the thermostat is not opening - the radiator top hose should start to get warm as the engine heats up, probably about 90°C.

[Emer]

Fit new head gasket new coalant pump and still the issue is not solved any help