I can make mine run cool or hot by adjusting the ball valve in the recirculating
line on my 5411. On mine the water recirculates until the thermostat opens then sends it out the
exhaust. When valve is all the way open the water takes the path of least resistance and continues to recirculate and very little goes out the
exhaust. As I close off the valve the water is less able to recirculate and more water goes out the
exhaust and the motor runs cooler. I need to adjust the valve through out the year as the water temp increases.