GE refridgerator fan speed changes constantly
I will try to answer your question . Your refrigerator had 3 thermistors in the refrig side , and 2 in the freezer side . These thermistors , send resistance messages to the main control board , mounted on the back of the refrigerator . If say #1 thermistor tell the board , I need to be colder , then the board will tell the damper ( small vent in the top of refrig section ) , to open . If the #2 thermistor tells the board , I need to be colder , then the board tells the fan to speed up , to get more air to the refrigerator section . #3 thermistor , works with the turbo cool switch , turning the fan to a high speed also . If the thermistors tell the board , we're all fine , then the fan will slow down , but still circulate to make/keep the freezer colder . If the freezer thermistors say , we're ok also , then the refrigerator will cycle off , until a thermistor asks to be cooler again . The fan works off D C voltage , in which fan speed is regulated (faster or slower) , by the thermistors "talking" to the control board .