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

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

Diagnostic Procedure:

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

2. Troubleshoot ECT 2 circuit performance problem P2183

Also check for:

- Climate control DTCs Initial Inspection and Diagnostic Overview
- Powertrain DTCs Reading and Clearing Diagnostic Trouble Codes
- Manual blower motor operation