Air noise from vent window seals?

[Skunksmash]

Here is a reply I got from the autobody forums, I thought it might help some other people here:

Originally Posted by Bob K

If you want to make a test of where the noise is coming from before you start trying to fix it you can work with another person to do this. Take duct tape and go around the window sealing the gap between the glass and the door. Do both sides. Next tape seal the gap on the passenger side so that there is no way for air to get into the cab around the door. Last get in the drivers seat and have your partner seal the gap on the drivers side. Now take the truck for a drive on a quiet road where you can safely make stops. Have your partner follow you. If you determine that the wind noise is gone you can stop and have your partner remove a section of tape from the drivers door. If after you make several tests and find that the drivers door seal isn't making the noise you can continue on your own since you can now open the door and get out to do more tests. Unseal the other side door, then do the windows until you locate the source of the noise.

If you find that with the doors and windows taped up you still have noise then you can assume it is coming from some place else like the vent below the windshield, the heater or maybe the back glass or an exhaust vent opening behind an interior panel that got damaged in the rebuild. Don't rule out noise coming through the sheet metal of the roof. Do you have clearance lights or anything else that could disturb the air flow across the roof? The roof skin could be vibrating causing the sound. Hope that gives you some ideas for places to look, but door seals are the most likely. By the way are they fresh and supple or are they the original seals that have gotten hard over the years?

Bob K