Fizzy Sound - Radiator Related

[Bennis]

Hey guys,

Just bought an R33 GTST and after an 11 hour drive I am finally home no problems what so ever.

It has a couple oil leaks that I was aware of, however there is something else I discovered when I got home that puzzles me.

Its 2am and dead silent in the garage, and I pop the hood and could hear a very very feint sound very similar to the sound you would get if you were to open the bottletop of a bottle of coke 1mm. Like very very slightly open the cap so that theres a tiny area where the fiz inside the bottle can escape and make a feint hissing fizzy noise. This is the noise I can hear in my engine bay. (sorry its the only way I could describe it).

When I apply very slight pressure to the upper radiator pipe with my thumb and index finger, the noise stops. I cannot see any water or coolant leaks anywhere and the car didnt overheat at all or even get hot on the 11hour drive home.

Should I be worried about this??

[niZmO_Man]

Should be fine. Since you just got the car, I recommend doing a full service including a radiator flush.

[Bennis]

Did oils/coolants today actually and took it for a drive and no more strange fizzy noises. All good guys

[jhjones]

Did you bleed the cooling system?

[SargeRX8]

Sounds like you had air in the system.

[Bennis]

Yeah not sure what the go is/was. Doesnt do it anymore and theres no problems with overheating or anything like that so I guess its all good then