5. Coolant
A rather short section. The only coolant I recommend is distilled water. It has the best cooling properties short of exotic fluids created by 3m (cost upwards of 1000 dollars to fill your system), has relatively low conductivity compared to regular tap water, and is cheap. There is NO need for all of those so-called non-conductive fluids as NONE of them actually are non-conductive. They have moderately higher resistance than distilled water, but will still damage sensitive electronics.