Actually, you don't have to see coolant in the oil to have a bad head gasket. It could be leaking compression and you would never know.
As far as the radiator, what happens is they corrode inside and don't allow the coolant to properly circulate. If there are any radiator shops near you, you may want to remove the radiator and have it rodded out. They actually boil the radiator in a solution that will eliminate the corrosion and build up. Where I am, near Pittsburgh, there is a shop that does it for around 30 bucks, and when they finish, you can't tell the radiator from a new one. They have always worked for me for years after the work is done.
Keep in mind, flushing from the overflow really doesn't allow that much pressure to clean out the radiator, so this may be a condsideration for you.
Tuesday, May 2nd, 2017 AT 4:14 PM