Overflow bubbling

[6pak]

Hello again, my 1980 280z has a burbling (slowish) noise coming from the overflow tank. the car runs fine and does not overheat, doesn't seem to be using water either, is this normal?
the oil is not grey or murky and radiator itself is full. im just wondering if there is a bit of air in the system?
any ideas would be appreciated.

thanks

Chris

[Blue]

Does the water in the rad bubble if you start the car cold with the rad cap off?

Pressure in the coolant system can only be caused by heat or head gasket leak.

[6pak]

Hi, no bubbles with cap off. Water level just slowly rises up and overflows out of radiator. It's got me scratchn my head. Cheers

[olzed]

Sounds like a head gasket on the way out to me.

[6pak]

Bugger! Cheers

[black gold man]

CK overflow hose and fitting at rad for clog.

[6pak]

will do tonight, Cheers