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I had this problem on my 99 - it was inside the trunk - along the wheel wells. The body shop found it.

AnswerWe have a 2000 Pont Bonn and had water build up at the bottom of the trunck lid, which caused it to leak out when we opened the trunck. Dealer checked it several times and found no leak. One day I noticed small rubber plugs on the bottom of the trunk lid-when opened. I removed them and water drained out and since then we have not experienced the problem.

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I had the same problem with my 2002; removing the rubber plugs would let it drain, however I tracked the problem down to the seals around the mounting bolts for the spoiler. I tightened them and the leaking stopped.

Answerone thing you might check is under the trunk rug, by the wheel wells, I had bought a lesabre once and it had rusted wheel wells and didnt notice, and water would get up there and into the trunk.
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Q: If the trunk is leaking on a Pontiac Bonneville but there is no apparent problem in the seals how could the water be getting in?
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