Engine overheating most common: Problem------Solution 1. Thermostat---(easy and cheap fix)------take the radiator cap off..start you car....look inside you radiator..if you see NO water flowing rapidly..then replace your thermostat 2. Blown Headgasket---(worst case) check the oil....if there is water in your oil...then your screwed....take it to a mechanic or replace your engine.