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Inspect the sun roof of your Pontiac Bonneville to make sure it's seated evenly on your vehicle, not raising or lifting at one corner. Lifting indicates the presence of debris on the tracks, or a damaged seal around the sun roof.
Remove the trim on the interior of your Pontiac Bonneville and allow the interior material to drop. Use compressed air to blow dust and debris from the tracks that move your sun roof. Treat the tracks using 3-In-One Lubricant.
Check the Pontiac Bonneville's drain tubes for clogging. Two of these run down the front of your vehicle to the bumpers. Two run to the back, most often by your tail lights. Clear the tubes using compressed air and replace them.
Clean the sun roof's rubber seal with a damp, lint-free cloth. Inspect the seal as you clean
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