... Water Wetter is product you add to your radiator that helps water flow faster and transfer more heat from the engine. Costs about $10 for a bottle of the red fluid. Also check the quality of your coolant, too much antifreeze can make your engine run hot. Keep the mix at 50/50 in the summer. Any less will not protect the metal parts from corrosion and may promote boil over in hot temps. Also consider flushing, and driving with the windows down and A/C off climbing tall hills in summer, and reduce speed and use a 3rd or lower gear while climbing. Hope that helps