Changing heater core

[shadowgray396]

Your inside heater box will have 5 studs that that goes through the firewall and the nuts will have to be taken off. You will have to take the the heater control cables off also to get the inner box away from the firewall. Don't forget to take off the heater hoses. Here's a picture what the box looks like inside. Hank is correct the outer box will stay in place because it is chaulk to the firewall. Its not to hard to do, but can be a pain to get it out.
Ray