[Tom Wesenberg]

I would go to Menards and buy a 10 foot roll of clear plastic tubing that fits the overflow pipe. Then run the tubing into the passenger side and have it fit through a hole in the cap of an empty gallon milk jug. Run the hose to the bottom of the jug, then drive the car and see exactly when the coolant leaves the radiator and how much leaves. Drive the car up a couple hills and see if that makes the coolant leave the radiator. When the test is done you'll have the coolant to dump back in, that is unless it was being overfilled to start with.