To cool down an engine on the verge of overheating, turn off the air conditioner and turn on the heater full blast. This will help dissipate heat from the engine. Stop the car if this doesn’t cool down the engine. This is not a permanent fix. Schedule an appointment to fix the problem.
Avoid overheating by reducing the load on your engine. If you are climbing a long hill, turn off the air conditioner or shift into a lower gear. This will allow you to get over the hill without overstraining your engine.
Don’t open the cap on the radiator when it’s hot (right after the car has been running for a while). The hot fluid inside is under tremendous pressure and can shoot out and burn you.