Q: My grandparents gave me their 1998 Chevy Astro for free. Now I am using it and I can’t stop it from overheating. I have had fan belt, hoses, the fan clutch, temp gauge and radiator replaced. In desperation, I bought and had a used engine installed. The temp gauge still goes up to three-quarters and most of the time comes back down while still driving. Sometimes I have to park it and wait several hours to get it to cool back down. What is left to check?