To flush the cooling system first loosen several hoses under the car and drain as much of the old coolant out as possible fron the engine, radiater, and heater core. Tighten the connections back up and fill with clean water. You can do this several times and dispose of the old coolant properly. When the water drains out clear now you can flush. Loosen one of the hoses under the car and as the water is draining out use a garden hose to keep the system full as you run the motor. After a while stop the motor, shut the water off and drain as much water out as you can. Now refill with a 50/50 mix of water and Premium permanant anti-freeze. Top off and bleed. Pressure test when done. The system MUST hold 15 psi for 15 minuetes. Before you flush you should have replaced all of the 20 year old hoses and seals so you don't waste all of that new anti-freeze. I guess you should pressure test BEFORE you flush! David Teitelbaum vin 10757 --- In dmcnews@xxxx, "carnut4849" <gmfm1@xxxx> wrote: > Dear Ed, > I have used the Prestone Flushing Tee on all of my cars since it > came out back in the 70's-80's. It works really well. I have not used > it on my D. I am interested in how others flush the system as well. > Remember that in many places it is illegal to flush the system > out and let the coolant run into the sewers and into the ground, so > be careful. > Happy Motoring, > Gary Masie > > > --- In dmcnews@xxxx, "edherrmann" <edherrmann@xxxx> wrote: > > > What is the best way to flush out the cooling system. > > Thanks. Ed 10078, 16228