M35 vq25det cooling issues

[Damom8]

Hey guys just recently bought a m35 drove it 2 hours home no worries, drove it to and from work for a week but on Saturday it started getting a little hot going up a pretty steep hill whilst boosting, nothing serious it went up to halfway between operating temp and hot on the gauge, pulled over cooled down and drove it a few mins home. Filled it up with coolant cause I thought maybe it was just low on coolant then later that night coolant started coming out of the overflow, it had no thermostat so I put one in and changed rad cap now it can't run more then 10 mins without coolant coming out of the overflow and waters not getting through the thermostat even though it's brand new. Previous owner told me turbo was shoddy and was pressurizing the cooling system (I thought he just had no clue what he was on about in all honesty) so I'm curious as to if this is actually a possibility or does anyone have an idea that doesn't involve the head gasket being blown because that is the last thing I want to have to change on a car I just bought but if it is the head gasket any pointers on doing it myself looks like motor has to be taken out or can I get around taking it out? 

Thanks in advance for any help

[GTSBoy]

9 hours ago, Damom8 said:

halfway between operating temp and hot on the gauge,

That's very hot. It's also no indication of exactly how hot it was because if the sensor is not in water then it cannot tell you what the water temp is. If you lose water, you may not have had a wet sensor.

9 hours ago, Damom8 said:

Previous owner told me turbo was shoddy and was pressurizing the cooling system

Hahhahahahahahhaha.

9 hours ago, Damom8 said:

an idea that doesn't involve the head gasket being blown

No. It has a blown head gasket or two. You bought a car with a blown head gasket and teh seller actually warned you of that fact. You now have to pull it apart.