1999 tahoe ac water leak inside

Andrew, It would appear that your a/c drain pan tube is plugged. Jack up your vehicle on the passenger front side. Slide under and look for a tube with an open end. It should roughly be about as far from the front as the windshield. Put your Shop vac to the end of the tube and it will usually suck out whatever is clogging the drain pan. You will hear when the plug get sucked out. Good Luck