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I checked the o rings in the pressure relief valve and the larger ring was bad - replaced it and the relief valve holds better than before but still leaks.
I can now trace the leak to the point where the pressure relief valve mates to the tank - you can hear the hissing after using the Airlift and creating a vacuum.
Unfortunately, since it is still not airtight, the coolant expands when hot and overflows. I have ordered a genuine Porsche OEM tank and learned a lesson to not cheap out on that part!
Whay a pain!
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