as title says, just turbo'd a d16z6 for low boost and coolant is boiling so i changed the rad for teg rad and then i changed the head gasket it doesnt overheat but it pushes water out of the expansion tank! somebody suggested it could be a worn water pump any suggestions please!!! at my wits end with this trouble thanks for any help.

 

you change the thermostat?

 

are you talking about after you drive the car and shut it off you can hear boiling? If so that means your system isn't pressurizing. Same thing happen to me....it ended up being a TINY and i mean TINY hole in a hose. Coolant wouldn't come out but it would pressurize. Id replace the upper and lower radiator hose.....it could also be the radiator cap. Try replacing that too.

 

I will give it a go! gonna try replacing thermostat and rad cap! thanks for the help really appreciate it!