1999 suburban leaking water inside on passenger side?

If your 1999 Suburban is leaking water inside on the passenger side, it could be due to a clogged or damaged windshield drain, a malfunctioning door seal, or a leak from the heater core. Check the drainage channels around the windshield and sunroof (if equipped) for blockages. Inspect the door seals for any cracks or gaps, and look for signs of coolant leakage, which could indicate a faulty heater core. If the issue persists, it's advisable to have a professional mechanic assess the situation.