My res tank overflows and I lose a bunch of coolant when I drive around. It comes out the top of the res tank. I just replaced the radiator and I'm about to put a new thermostats in. From what I read it's blown head gasket.

 

run a compression test

 

Too late already blew head gasket

 

then you need to pull the head and have it resurfaced and get a new head gasket set and new head gasket bolts since they are now stretched

 

I overheated it with a cracked radiator and bad hose. Blew the gaskets bc of it I'm guessing

 

Ok, that was going to be my next question, about the bolts.

 

What do you mean by resurfaced?

 

I suggest watching Schrodinger's Box video "Replace a cylinder head gasket yourself and do it right"