I have just recently replaced the whole cooling system after the radiator hose leaked badly. Now the engine runs hot during stop and go traffic (2-3 mm past the center temp. mark). I searched the database and a lot of people say to "bleed" the system to leak out air pockets to make to engine run cooler. Exactly how do you do the bleeding? (i.e. when the engine is cool or hot, running or stopped?) Please help.