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Driver visibility is a critically important factor when driving in all conditions. A faulty heater control valve can cause issues with the water flow to the heater matrix, which can affect the de-misting performance of the interior heater - therefore impacting visibility for the driver. In this video the heater control valve is tested and replaced on a BMW E46, with the entire replacement process explained from start to finish, with helpful step-by-step audio instructions from the narrator, makes this a comprehensive and easy-to-follow guide.