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Chevrolet TSB #N222375000
2021 Chevrolet Silverado 1500
TSB Document:
Affected Component: VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM
- Summary
- In certain vehicles, equipped with a manual HVAC system (RPO: C4P), the K33 HVAC Control Module may not properly enable the heater auxiliary coolant pump to maintain cabin heater temperature during engine auto stop events. Reprogram the K33 HVAC Control Module with updated software.
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