Chevrolet Silverado 1999 — technical service bulletin
Bulletin 99027A · NHTSA communication 607680 · issued Sep 1, 1999
Technical service bulletin
communication type
Power Train
component
1999
model years
3
vehicle entries
Official summary
General motors has decided that some vehicles may not have included the merchandising-intent auxiliary transmission oil cooler (knp). *tt
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.