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i hear a fan running

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It could be coming from your radio.

On some models...if the engine is running...even if you turn the HVAC completely off... the fan still runs on a real low speed, for forced ventilation of the cabin of the vehicle.

On some cars...it could also be from the aspirator.

There is a little vent looking opening just to the left of the radio or just to the left of the steering wheel... depending on make and model.

There is a small fan behind that...it is part of the automatic climate control system.

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