Blower Fan Runs Slower Than Expected In Cold Weather (When In Auto Mode) Note: It Is Normal For the Blower Fan to Run Slowly
Blower fan runs slower than expected in cold weather (when in AUTO mode) NOTE: It is normal for the blower fan to run slowly until the coolant temperature rises when in AUTO mode
Probable cause: Engine coolant temperature (ECT) circuit malfunction
Troubleshoot ECT 2 circuit performance problem, '07-09 model, '10 model P2183
Also check for
Climate control DTCs How To Troubleshoot The Climate Control System
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Powertrain DTCs, '07-09 models Initial Inspection and Diagnostic Overview'10 model Initial Inspection and Diagnostic Overview
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Manual blower motor operation