Equinox AWD V6-3.4L (2008)
Water may be entering through the seams in the floor pan on the driver side and/or passenger side.
Cause
Insufficient body sealer may be the cause.
Correction
Remove the carpet and reseal the sheet metal seam.
Condition 3
Water may be entering through the liftgate weatherstrip (between a gap in the sheet metal at the bottom).
Cause
Insufficient body sealer may be the cause.
Correction
Remove the weatherstrip and reseal the sheet metal.
Condition 4
