Clean radiator, cool engine, coolant PH, flow, fans, shrouds.

One item of caution I'd like to add to the topic, for those of us using aluminum parts exposed to the coolant. I.E. Heads, Radiators, Intake manifolds etc, I strongly recommend that you avoid using the Extended Life/ Dexcool type coolants in your car. The orange stuff. It is far too acidic & will eat away at the aluminum. I have disassembled engines that were so pitted & eaten away by it that the head gaskets would no longer seal. I know there will be guys saying they have run it w/o problems but I warn you that every trade publication I have read on the topic strongly advises not to use it even in GM cars. GM of course won't admit to it because they would be sued for all of those vehicles that have had the sludge problems clogging the radiators because of it. All of the Japanese car makers, Ford & Chrysler all say it will void your warranty if you use it. Stay away from Dexcool!