ok,here we go i like most of you guys have a leaking problem on the pass. side of the cab, no it is not the heater core, a/c vent relief line. from what what i compiled from this site is uderneath the block off plate there is a fresh air vent. the seal on the vent needs to be re-sealed because the factory seal is junk. use plenty of black rvt dont be cautious on this. then reinstall the vent block off plate and put the cowl and wiper arms on. paint the area if you want but it is not needed
crossing the fingers hope it works once the rvt sets up
i will keep you guys posted
i was told by a friend at the local chevy dealership that on all 1996-2000 c/k trucks have this problem because the cowl was reformed in 1995 my farther has a 1988 k3500 and we removed the cowl on his truck and compaired it to my 1998 and they were completely different
ps: the truck only leaks when it is parked @ an angle because of the water pressure build-up against the vent wall/ seam
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thanx fire730