RQB3263/81/305 .... i WANT TO FLUSH 3263S COOLENT/HEATER SYSTEM .... when it warms up .... There is a flush port in one heater hose.... appears original... that will allow me to attach a garden hose...... besides disconnecting the lower radiator hose what is the procedure for a complete system flush ?? thanks, Merry Christmas and stay warm up there , 21 in melrose, florida