u'll have to take out all ur a/c freon first.

then go under the hood and look @ the freon tubes going through the firewall. unbolt OR UN-NUT them (there're 2).
then remove the glovebox. there's a fan on the right and the heater core on the left.
the evaporator core is in the middle. there're about 4-5 10mm bolts that u'll have to take out after u take out all the bolts pull the evaporator core out.