you must take the entire dash apart for the first gen diamantes at least (92-96)
i tried doing it without and its impossible they way the have it designed..also the first generation is the hardest to locate a heater core for unless you get one from the dealer which is 400 dollars,but that should suffice and i will say this it is at least a 5 hour job the book calls for 8.
Im doing the same thing to my mitsi as well and i am just going by trial and error ...but i have found out that the heater core is behind the centre console so the whole thing will needed to be removedthen its just a matter of removing the 3 bolts holding the heater core in place and working it out of behind the steel centre console brakets. Or you can remove the whole dash...which is a huge job
Get a manual on your car and do the job correctly.
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