Coolant Spraying From Radiator Cap in my 1931 Ford Model A Pickup – The Fix

Several months earlier, I had drained and flushed the radiator and added about two and a half gallons of new coolant (Watch my video titled, Changing the Coolant in a 1931 Ford Model A Pickup.” The capacity of the cooling system is around three gallons. After changing the coolant, every time I went for a 15-minute drive or longer, at about 35-45 mph coolant started spitting from the radiator cap striking the hood and windshield. I did some basic troubleshooting of the water pump, fan belt, spark plugs, etc., but could find no reason for the spitting coolant. Then when I mentioned this issue to a fellow member of the Sequim Valley Car Club, who also owns a Model A. He told me that I had likely over-filled the radiator, and that when he changes the coolant on his Model A, he fills it up to where he can see if looking into the radiator cap, then he drains out about 16oz. Well, his solution from experience worked for me too!