With that kind of mileage I would really look at replacing the water pump and since you are in GA also put in the low temp thermostat. New pump from SunCoast is about $258 and the thermostat, get the $75 one, it's the same one that LN Engineering is selling for $177 from Pelican Parts. Coolant, you can use any longlife, just use distailled water when mixing.
