Testing a zero pressure radiator cap

[Steve Meltzer]

I suspecct that the zero pressure radiator cap on my GTC is leaking. How do i test this? There is obviously pressure in the radiator from the hot coolant, so there must be a specification forr that cap, even though the cap itself is not exerting pressure. Any advice? Thanks, Steve.

[tyang]

There is pressure on the cap on the top of the radiator on the 330 GTC becasue the cap on the expansion tank has a pressure spring on it. The flat seal with the nipple is available from Ciccoginani.

Tom

[Steve Meltzer]

A little follow up here. I just pressure tested the entire system, exerting pressure at the overflow tank and found that the radiator cap is perfectly fine. My problem is a leak in the middle of the radiator itself. So, question answered! I just wish it would've been the cap, and not the radiator!
Thanks, Tom.

steve

"Sometimes chicken, sometimes feathers"