The heater fan in an Audi A4 may not be working due to several potential issues, such as a blown fuse, a faulty blower motor, or a malfunctioning resistor pack that controls the fan speed. Additionally, problems with the climate control module or wiring issues could also prevent the fan from operating. It's advisable to diagnose the specific cause through visual inspections or diagnostic tools. If unsure, consulting a professional mechanic is recommended.
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