Chevrolet C4500 2001–2003 — technical service bulletin
Bulletin 030602005A · NHTSA communication 10002857 · issued Oct 1, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2001–2003
model years
10
vehicle entries
Official summary
Engine coolant loss with no visible leaks. *tt updated *eh
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.