my a/c in my 1974 cadillac eldorado has no power to it what can it be the fuse is good

Do you have power on both side of the fuse? Is there power at the climate control switch? Is there power at the compressor when a/c is turned on? Is the clutch on the compressor engaging? Do you see where I'm going with this? So many things can cause your problem. Bring it to a good A/C mechanic in your area...Good luck 97 Eldo Conv. man Frankie'D

96 Eldorado no power to a/c. Fuse and relay ok, what Next