I've got a 56 30 hp, I'm not having overheating problems but it seems that as quick as I start up I'm circulating water. Now I checked in my manual. The powerhead breakdown shows where thermostat is located on head. I have no thermostat cover on the head. After futher reading under thermostat section the manual says most outboards covered in this manual has a thermostat which leads me to believe that my 56 dosen't. Is this correct?