What could cause radiator fluid not to exit the out through the thermostat hose which has a new thermostat The car does not over heat and the radiator leaks at hoses and cap Top hose gets hot.?

If the top hose gets hot that means that the thermostat HAS opened. Thermostats remain closed until the engine warms up then the thermostat only opens enough to keep the temperature at about the set-point temperature of the thermostat. Just repair the radiator and enjoy the vehicle.