Are you talking about the fan inside the freezer? If yes, check the following items. The door has a switch that turns the lights off when the door closes, it also turns the fan off when you open the door. If it isn't working right the fan won't come on. There is also a round temperature senser on the coil inside the freezer called a "clickson" that keeps the fan from coming on until the coils are below 20 degrees, it may be bad. If you are low on freon, your coils may not be getting cold enough to trip the clickson. Feel of the small copper line going from the compressor to the coils on the outside of the freezer. It should be almost hot enough to burn your skin if you have enough freon. One other thing to check is the defrost timer. It is a box about 4 inches wide and 8 inches tall with a door on the front of it. Check the connections inside to be sure you are getting power through to the fan. Let me know how it turns out.
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In most freezers, there is a temperature device in the evap that is attached on or near the coils. It keeps the fans off during the defrost cycle and when the system comes back on, it will keep fans off till the evap cools so as to not circulate warm air. It's called a fan delay. I would look for that. They do go bad pretty often,. Some have 2 wires but some are multi-functional and can have up to 4 wires. Start there and let me know if I can be of any further help.
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