Im going to give my erst a coolant change soon, its something ive never done always taken to garages etc, i know u empty old water out, then im going to put a hose in the radiator and give it a good flush, then reconnect the hoses etc and put all the right antifreze mix in etc, whats the best way to bleed the system??, do u put the heaters on hot etc .........any more tips cheers all......p.p