1999 1500 Suburban. I just found water leaking from behind the what I believe is the blower motor under passenger side floor board. I can press up on the bottom of it and water pours out. I took the plastic guard off under the windshield wipers. When I spray water on the right side it flows out from under the fender and also under the dash. Any help would be appreciated

Maybe a plugged evap drain. You should see the outlet on the firewall, passenger side of the engine compartment, From underneath.

Is the evap drain the same thing as the AC condensation tube that runs just under heater hoses, it is a 90 degree tube??

A clog in evap tube will allow condensation to build up inside pass compartment, but when you spray water from outside your veh it should not be able to come in. I would think you have a rust through area in firewall. Try using extension mirror and light to locate. Then you can try to silicon or seam seal closed. Good luck

Check the sealant around the fresh air intake. I had the same problem. You may have to remove the grill below the wipers on the passenger side and the valance panel wher the glove box is to see it.