Blower Fan Runs Slower Than Expected In Cold Weather (When In Auto Mode) (With Climate Control)

Blower fan runs slower than expected in cold weather (when in AUTO mode)

Probable cause: Engine coolant temperature (ECT) circuit malfunction.

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Climate control DTCs How to Troubleshoot the Climate Control System (With Climate Control)

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Powertrain DTCs

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Manual blower motor operation

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Engine thermostat