Also make sure the coolant system is fully re-filled. I don't know of your situation, but you may have lost some coolant out the overflow tank. When I've overheated, the coolant pressurized, bioled over and had to go somewhere; vapors take up much more room than liquids. Mine filled the overflow reservoir and then continued to add steamy hot fluid to the reservoir overfilling it and releasing coolant out the overflow cap. Then, when it cooled down, it sucked up the coolant back into the system as it should, but it ran out and the overflow ran dry. Since it still needed more volume, it sucked air through the overflow tank and into the coolant hoses. This left me short on coolant not just in the overflow tank, but also with air in the sealed system.
Before going on a long drive, I'd make sure it was filled, and maybe take a few gallons of distilled water or 50/50 mix with you.
1988 Fiero GT
Cleveland Fiero Club