On the passenegers side of the engine compartment where the blower fan is,
that is where the heater core is at. the cover has to removed. I think the
crews are 10mm as i had to do this recently myself. it is hard to do this
when the hood on as you need more room but it can be done. You have to
remove the blower first and detatch the electrical connectors. After that
the cover has to be removed. When that is done you can see you heater core.
There should be a "L" brackter type piece that holds it in place. Of coarse
the heater hoses have to be removed. When you put the cover back on be sure
to use some caulk to seal it so when it rains in wont leak through and soak
your interior....hope this helps