[bobcowan]

Surfactants like Water Wetter and Cool Ice is not a magic panacea for overheating. Take a look at what it is, and how it works.

Water forms a boundary layer on surfaces as it moves through the cooling system. Look at the meniscus in a glass of water or test tube. The boundary layer adheres to the metal surfaces, and moves slower than the rest of the fluid. It slows down the transfer of heat from a hot surface like the head into the coolant. By the same process, it also slows down the transfer of heat from the coolant to the radiator fins.

Surfactants break down the boundary layer and allow the heat (energy) to move from one place to another more easily. They can also eliminate the slow moving boundray layer. It will "pull" heat out of the heads and put it into the fluid. Then it will "push" heat out of the coolant and into the radiator fins, where it can dissipate into the atmosphere. Essentially, it makes the existing cooling system a little more efficient.

Where do most people put the sender for the temp gauge? In the engine outflow tract. That coolant will be carrying more heat (energy) than it did before, and make the gauge read hotter. If you want to know how well it works, put the sender in intake track, like just before the water pump. Or install a cylinder head temp gauge.

Benefits to be gained from a decreased cylinder head temp is a cooler intake charge, less detonation, more power, and increased efficiency. It will not make up for a bad tune, or a poorly designed cooling system.