HVAC Blower Continues to Run with Key Off - kw corrosion CJ2 information AC heat control mode air condition moisture water module fan

The following diagnosis might be helpful if the vehicle exhibits the described in the PI.

Some customers may comment that their 2003 Full-Size Pickup / Utility A/C blower motor continues to run even when the key is removed from the ignition. The root cause is an internal failure within Linear Power Module ( LPM ) or also known as the Blower Motor Control Processor. The supplier has corrected their internal soldering process and effective with shipments after March 3, 2003, all LPMs should be good. The service fix is to replace the LPM (P/N 52495874).

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance.

(03 CHEVROLET FULL SIZE PICKUPS AND UTILITIES) and (03 GMC FULL SIZE PICKUPS AND UTILITIES) and (03 CADILLAC FULL SIZE UTILITIES)

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