I have a heater in the water bay that is controled by a 12 volt thermostat and is warmed by the webasto. The fan doesn't want to turn. I touched the fan with a long stick and it turns as long as I keep the stick pushing on it. I doesn't sound like the fan is sutck. Does anyone know if these fan are controlled by anything other than a electricity. i.e. some kind of blade that retracts it it get so cold and let the fan run?

GregM