RE: Heater Core Removal/Installation
I replaced my heater core last November. The whole dash will have to come out. The steering wheel can just drop down, be sure to unhook all harnesses. I did break loose the A/C lines right where they go into the firewall, had to get a vaccum pulled and recharged ($60 at a local A/C guy). I had all the right tools, and a factory service manual, and it still took me about 12 hours (had a time getting the fan off). Oh, yeah, be sure to keep the fan and clutch vertical--has a fluid clutch and according to the manual laying it down will damage it.
I WILL NEVER do this again, TAKE IT TO A SHOP!!!