I've noticed a few times after shutting down hot, that there are bubbles in the overflow tank, for up to a few minutes after the car has been turned off. I think it might even do it when driving, but it's very noticable after shutting down as I can hear it pretty loud. Is this normal?

 

No one?? Helllloooooo is there anybody out there?

 

Have you done any other work to the car recently?

 

youve got a bad radiator cap... start by replacing it.

 

Or a blown head gasket