Coolant Flush

Next I will show you how to flush your cooling system on your e46 3 series. For this job you will need a jack and stands, a catch pan, new coolant, a flat head screwdriver, and a 19 mm wrench. First jack up the car and put it on stands. Take off the radiator cap be sure the car is cool and the cooling system is not pressurized! Then loosen the hose clamp on the hose on the bottom of the radiator. Pull off the hose and let it drain into the catch pan. Next locate the 19mm plug on the exhaust side of the motor(located in the yellow circle). Remove this and let it drain completely. Next reinsert the drain plug and reconnect the lower radiator hose. Unscrew the bleeder screw located next to the coolant reservoir on the upper radiator hose. Then get your coolant, if it is not mixed be sure to mix it first, I would recommend BMW coolant. Fill the system through the reservoir until coolant comes out of the hole where the bleed screw was. When this happens tighten the bleeder screw and fill the reservoir to the top. Put the radiator cap back on and you have successfully flushed your cooling system.