oil in the coolant

[Nunofil3]

Hi all,
I have a DS3 1.2 L Petrol puretech 2016 that already gave me a few problems. The last one is a leak of coolant and oil traces on the coolant bottle but no trace of coolant in the engine oil.
i have found the leak which is from the engine Coolant Union hose that connects to the engine block from the electric auxiliary water pump.
The first thing i hear is that the head gasket gone but can this be the oil cooler instead?
There is some white smoke coming off the exhaust when accelerating.
any ideas?

[Nunofil3]

Evening,

I have a DS3 1.2 Petrol manual 2016. i have found some traces of oil in the coolant bottle and i suspect that the oil cooler is the cause of it.
I want to replace it but i don't know the part number. Does anyone can help me with this please?
I have added a pic for reference.
Thanks in advance.

[GiveMeABreak]

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