Chevrolet Silverado 1500 2023–2025 — technical service bulletin
Bulletin PIT6329 · NHTSA communication 11013411 · issued Jan 31, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2023–2025
model years
6
vehicle entries
Official summary
This Preliminary information communicates an issue with reduced coolant flow through the heater core degrading the heater performance of the HVAC system.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.