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I did that job 10 yrs ago. I do not have any notes but can tell you what I remember. at the time i had a paid 1 yr subscription to All Data on line manual for the car, used that as a guide.
Basically the entire AC/heater module with all the ducting and servos is removed from under the dash. It is held in place by 3 or 4 bolts that extend through the firewall with 10mm nuts on the engine side. Of couse you will disconnect the heater lines and AC lines at the firewall. I think I removed the glove box and a lot of the dash trim. Seem to remember that there was a corrugated metal safety bar that had to come out from under there and duct connections. Also I believe there was part of the center consol that had to be removed in order to have clearance to wrangle and angle the whole unit out. Keep notes and/or pictures as you disconnect things. Once the module is out replacing the actual heater core was easy. Check the vacume servo motors while you are in there.
I did have some difficulty re-wrangling the unit back into place and lining up the firewall bolts to their holes in the firewall. You will also have to vacume and recharge the AC freon.
Consider carefully if you really want to attempt this job. If the heater core is leaking into the passenger compartment you always have the option of bypassing it at the firewall and going without heat.
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