Jeep Grand Cherokee 1999 — technical service bulletin
Bulletin 184598 · NHTSA communication 603140 · issued Dec 18, 1998
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999
model years
1
vehicle entries
Official summary
Some vehicles may exhibit an engine vibration, repeating " beat " like sound, or a " drone " like sound with a warm engine during idle. *yc
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.