The evaporator drain is suppose to drain off the condensation (water). If you plug the drain the water will end up inside the cabin on the floor.
group 25
Yes.
There are 3: the Xa, Xb, and Tc
Scion XA wiring diagram is a drawing and information. In the wiring diagram it shows how to work the wiring.
Three and three-quarters max, and three quarts min.
11.6 Gallons
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YES
It is probably a burned thermal switch. I had the same thing on my car and had to replace the thermal switch
scion xa and xb
4 quarts