you may never hear the fan in winter - my car maintains engine temperature of 90-95C all day long and I dont hear the engine fan. when it was bad - it would raise temperature.

simple test for fan is on cold start, the fan should be engaged for a short time - 5-20 seconds (can vary) - the fan also requires the fins of the radiator and condenser to be clean as the fan clutch requires hot air to activate.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)