Leak under passenger side

[Curt]

If it's holding water in the blower motor, might want to check this thread out: https://www.gmt400.com/threads/a-c-drain-location.33648/ . Along with this one: https://www.gmt400.com/threads/the-mysterious-interior-rain-leak.15928/

 

[SHRT 1]

Does it leak after using the A/C or when it rains?

 

[deadbeat]

Phillips screws not having sealant on them above the fresh air supply was my problem on mine and my dads 1997 K1500 trucks. When they were parked up hill and it rained, when you moved the trump and turned on the fan you got a wet floor board. Over a year later after sealing mine it is dry as powder.