Re: Heater core box on the fire wall side ?
If you're changing the heater core, the engine side does not have to come off.
Remove the six nuts shown on the engine side, remove glovebox, and pry off the box inside after removing coolant. Lay down one piece of plastic to cover from the trans tunnel to top of toeboard to seat to over the rocker panel to collect remaining coolant from core.
Cables don't have be disconnected either. Use 5/16 inch socket to remove clip and pull out core. Compare size of replacement to OE core if still there. Some here have said new cores are of thinner design. If you can, have OE core repaired and replace in reverse order.
You can use clay weatherstripping to reseal the core box back against the firewall.
Instructions are for a non-A/C heater - I haven't done one of them.
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