evaporator

Hello, I am finaly attempting to fix the A/C in the 2006 LJ after 2 years and living in Texas. Currently, If I recharge the system, it will blow cold for a couple of days then warm up again. I ran a dye test and can not find any dye leaking inside the engine bay while following all the A/C...

Ok so long story short I took my jeep ti get the ac fixed last week and it already started blowing hot today. I took it back and the guy told me it was probly the evaporator. He quoted me 500$ to do it but I was trying to see if I could do it myself. What is the steps for replacing an evaporator???