Coolant additives

PowerTripp said:

Improved coolant mixes (80/20 anti-freeze percentages or lower), PG antifreeze (like Engine Ice, Sierra, etc.), and surfactants (Water Wetter, Purple Ice, Soft Soap, etc.) will not reduce the temp below the thermostat opening temp. But they will reduce peak temps, and the time to cool back down, when run hard in the heat of Summer.

There are lower temp thermostats available that can help as well.

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I've toyed with the idea of replacing the thermostat. Are they the same as a typical auto thermostat or are they something special? Also, would you recommend going as low as 160? Possibly swapping back and forth, winter to summer (I'm in Phoenix).

I'm really hoping that Sam's new radiator proves to be more efficient than the stock one. I do however think that having the fan so close to the engine block really limits its effectiveness. Once the fan kicks in it really struggles to bring the temps down, especially in 100+ ambient.