Water is collecting in the right rear floorboard while running the a/c.
Pulled the carpet up in the rear and front passenger floorboards and found that it was wet from where the floor pan comes out from under the dash all the way to the back seat. Water will collect up to 2 inches in the back floorboard.
Your evaporator drain is clogged. It's located in the engine compartment, on the bottom of the heater box. You'll see a small hole. Use a wire coat hanger or compressed air to clean it out. HTH. -Jim
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