Boxster Coolant Leak from Overflow

[the5]

Having coolant leak out of the overflow of my Boxster.
I have replaced the Bleeder with an aftermarket piece and have a new OEM Cap on the way but the one on the car is the most updated one.
As you can see in the video as soon as I open the coolant cap it all rushes back.
I was thinking head gasket but the Oil looks perfect.

I guess my next thing would be to swap the Coolant Tank for a New OEM one unless you guys have some other Ideas.

https://youtu.be/5iwDyCgY9oE

[Starter986]

The link you proivde delivers me to a private video.

[the5]

Fixed link should be good now

[rick3000]

Is it leaking or draining from the overflow?

If the car is draining all the coolant from the overflow, you have an air bubble and need to purge the system using the correct sequence. If that has been done, it could be the seal on the cap. If the tank itself is not leaking, it is not the issue. What have you done recently with the coolant system?

[Starter986]

Saw the vid.

OK. Some general stuff...

Stay away from the aftermarket stuff... unless it's OEM (You know... it's the same manufacturer Porsche uses but the parts are ab$ent the ex$pensive Por$che "P").

Next... replace the vent piece with OEM.

Next... replace the vent cap. You already replaced it? Replace it again. OEM. Period.

OK. New vent piece and cap? Next...

Maybe consider a system pressure test... AFTER you replace the two above parts.

OK. Replaced the two parts... had the pressure test done... keep that vent piece closed. Close it.

Fill the reservoir tank and, if you choose to replace that too... go OEM. Quit cheaping out with aftermarket parts.

Report back. Best wishes.