i think your overheating issue may lie at another problem. have you changed your thermostat lately, fan clutch, did you do a proper flushing if you changed the coolant, i mean proper bleeding (get those bubbles out) when was the last time you replaced your water pump?
i don't hink you want your car overheating often and for a long periods of time, the engine is too fragile for that.
just my 2 cents.
