Chevrolet Astro 2003–2004 — technical service bulletin
Bulletin 01485 · NHTSA communication 10005500 · issued Jan 1, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003–2004
model years
14
vehicle entries
Official summary
Timing chain tensioner breakpoints for service kit or production fix. Rattle-type noise coming from the engine at approximately 1800 to 2200 rpms. 4.3l lu3 l35 engine. *tt
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.