Coolant tank not holding vacuum

[brewerbry]

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!

[Mark_T]

Originally Posted by brewerbry

I have ordered a genuine Porsche OEM tank and learned a lesson to not cheap out on that part!

Whay a pain!

You are not the first and certainly will not be the last person to learn that particular lesson the hard way!

[brewerbry]

I replaced the el cheapo tank with a genuine Porsche tank from Pelican and guess what - it now holds a vacuum. I admit I vacuum tested the new tank before installing it and it was good.

The bad tank had aflaw in it by the overflow relief that kept it from ever sealing, the injection molded plastic did not travel to the far ends of the mold.

Lesson learned!