Occasionally the rear seat belts lock up and won't release. I ask the kids if the jerked it quick they claim they don't. They stay locked up for a few days then eventually they release.
Any ideas?

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1987 MB 300TD, 245,000 miles running great, converted to WVO.
1996 Ford F350 2WD,PSD,CC,DRW custom conversion, soon to run on WVO.
2003 Toyota Matrix,4WD (wifes)