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

Troubleshoot the ECT sensor circuit:

ECT sensor 2 circuit low voltage DTC Troubleshooting

ECT sensor 2 circuit high voltage DTC Troubleshooting

Also Check for

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

Also Check for

Powertrain DTCs

Also Check for

Blower motor operation