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TSB
99-2-2
  • NOISE - "BUZZING" - UNDERHOOD WHEN AIR SUSPENSION IS IN OPERATION
Publication Date: JANUARY 22, 1999

LIGHT TRUCK:
1997-1999 EXPEDITION, F-250 LD
1998-1999 NAVIGATOR

This TSB article is being republished in its entirety to add 1998-99 model year vehicles.

ISSUE:

An underhood "buzzing" noise may be heard during air suspension operation. This may be caused by:

  • the air pump lines being routed too close to the front end sheet metal
  • the wheelhouse inner may be sensitive to vibration input of air suspension compressor

....


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