Chevrolet Blazer 1996–1997 — technical service bulletin
Bulletin 990602012 · NHTSA communication 606523 · issued Jun 1, 1999
Technical service bulletin
communication type
Engine and Engine Cooling
component
1996–1997
model years
13
vehicle entries
Official summary
Conditions with heater inoperative, blows cold air, engine overheats, and rust in the coolant system. *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.