Originally Posted by
hornetball
Huh?!?
The theory of running both fans when driving at Auto-X speeds is valid (not needed and not helpful at track speeds).
But turning on your AC? Never, ever. Assuming your AC is charged and functioning, there is no better way to overheat a Miata than to add load to the engine and preheat the air with a hot condenser.
For Auto-X, find a way to run both fans WITHOUT engaging the AC compressor. People usually wire the AC fan to turn on with the normal cooling fan.
Also, your OEM temperature gauge is a liar. It's non-linear and will stay in the middle even as your water temp is creeping past 220. By the time it's indicating hot, you're HOT!! This is on purpose to minimize warranty service. Install an aftermarket temperature gauge if you want to know the truth.