Toyota Echo's conditioned air evaporator

Greetings I am new in this forum I would like to a problem that I have with the evaporator of a Toyota Echo 2000 is that it leads him to review because I stop cooling and they told me that it was the evaporator that I was on the panel, and I disassemble it but I did not see it I would like if anyone knows how to disassemble the evaporator or have a scheme, diagram or manual that I could do it I will do them myself.