I HAVE WATER ON FLOOR AFTER RAIN ONLY 99 P/U AND 99 TAHOE BOTH. NO RUST. WHATS THE PROBLEM AND THE FIX? THANKS FOR ANY HELP, GOOD HELP ESPECIALLY!

 

Most likely its the windshield...most other things leak right away,not years later...if your sure its rain waTER AND NOT A/C

 

if you are sure it is just water, then it might be coming in from the door seal above the window. I doubt that it is the windshield, but I could be wrong. You want to make sure your heater core isn't leaking. I ran through 3 of them on my 91.

 

I 2nd the heater core