I took the thermostat out of my freelander....and decided to test it...and I also bought a new thermostat...but it's confusing!... It has four water ports..one large one goes down into the motor.....if I look inside this hole I see what appears to be a closed thermostat on my old one....and a open thermostat on my new one. This is opposite of what I expected....if I put both in hot water...the new thermostat closes...and nothing changes on the old one.....so I am assuming there is something that I am not understanding...the new one is probably working....if so it closes the large home when hot and opens it when cold. WHY??...Does the thermostat closes this hole so circulation can occur in the other ports??..I don't get it..hoping some one can shed some light on how the thermostat works