@Seethaler posted:Thanks! The drivers side tube/hose goes in the lower port of the radiator, I hope, that is correct.
Thats correct, maybe you have cavitation into your engine because the long time of iddling there is not enough coolant flow into your engine.
I remember on a Mangusta this can be a problem.
Do you know for sure you have the right Cleveland thermostat or the Windsor themostat whit the block off plate ?
is your pressure cap on the pressure tankand not on the overflow tank ?
ignition timing not to early ?
when engine is on teprature , is the top of the radiator hot ? or cool ?
than it can be air into the system.
when everything is OK , for me it will be not such a problem that when a hot engine iddling for a few minutes the prsuure tank boiled a little.
there are some tools when you can check if there is exhaust smell into the pressure tank , that means a failed head gasket.
Simon