Chevrolet Envoy 2002–2005 — technical service bulletin
Bulletin 3104 · NHTSA communication 10010225 · issued Jan 1, 2004
Technical service bulletin
communication type
Equipment
component
2002–2005
model years
7
vehicle entries
Official summary
Only replacement of evaporator core or pipes for rear hvac. (to include 2005 chevrolet trailblazer) *sc
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.