Blower Fan Runs Slower Than Expected In Cold Weather (When In AUTO Mode) (Without 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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HVAC DTCs How to Troubleshoot the Heating and A/C Systems (Without Climate Control)

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Powertrain DTCs

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Manual blower motor operation

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Engine thermostat