Stop in for a cup of coffee

MAYDAY MAYDAY MAYDAY!!

Stuck alongside road in a 1943 M3 White with a flat head 6 Chrysler. Coolant pushing out from the cap. Will not go into the over flow tank, new hoses, new radiator, new thermostat, which has now been removed and still pushing fluid out. Overflow Line has had a brush ran down it, not clogged. Coolant is brand new. Engine temp is is steady between 140-155,