I have a 1985 Pontiac Fiero with a 2.5L 4cyl. engine with an auto transmission that is overheating after being driven for a while. The coolant is being blown out of the reservoir tank and is not being pulled back into the radiator.
I saw your answer to someone below after searching for a good block sealer: “If they DO suspect a blown head gasket or cracked block you might want to try a can of KW Engine Block Seal additive you can buy at your local auto supply. Drain out the coolant, add the can of additive to your radiator and drive the car for about 500 miles, then drain out the water/additive and install the proper mix of coolant and water to the radiator.