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 the heat from the engine. Stop the car if this doesn't cool down the engine. This is not a permanent fix. Visit Pro Automotive and have the problem permanently fixed.

Avoid overheating by releasing 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 additionally straining your engine.