Last one i had it was the cab lights.Guy swore it was the shield .

Where is the guy saying he is seeing the water leak? Double check the front and rear drain tubes. The roof clearance lights always leak, run a clear bead of sealer around them on the outside. If the windshield has been replaced, I would double check that as well. We have also had the odd one with roof seam leaks. Good Luck.

customer states both upper corners, he put water only on corners and get water both left and right corners . I will have the truck on Friday... thank you for the tips, markk

took w/s out of one three times told them the first time is wasn't the w/s had to find it for the dealer who insisted it was the glass turned out to be the luggage rack.

I've seen three of these in the last year. Two were the lights, resealed them with GM sealant. The other was the body seams where the sides and roof skin meet. Water was coming in from behind the A-pillar covers. Sent that one to the body shop. Carfax showed no indication that it had been wrecked, and the body shop said it was from excessive flex. Probably due to a LOT of off roading. H@'s are really not meant to be rock crawling and such, despite what GM says.