Chevrolet Astro 2003–2004 — technical service bulletin
Bulletin 01485B · NHTSA communication 10007272 · issued Jan 1, 2004
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003–2004
model years
18
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
- 2003 Chevrolet Astro
- 2004 Chevrolet Astro
- 2003 Chevrolet Blazer
- 2004 Chevrolet Blazer
- 2003 Chevrolet Express
- 2004 Chevrolet Express
- 2003 Chevrolet S10
- 2004 Chevrolet S10
- 2003 Chevrolet Silverado
- 2004 Chevrolet Silverado
- 2003 GMC Safari
- 2004 GMC Safari
- 2003 GMC Savana
- 2004 GMC Savana
- 2003 GMC Sierra
- 2004 GMC Sierra
- 2003 GMC Sonoma
- 2004 GMC Sonoma
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.