If I worked so much with this last night, please allow me to paste it
Well, I'm not sure if you can remove the A/C inside unit just by taking off the glove compartment and the knee pad. You should still try with that. You will need to unscrew the two pipes - thus first remove the gas from the system! - then you unscrew the relays, remove the cabling and the vacuum tubes and then the inside unit is held by the 3 screws that one can see. Be careful when removing the unit, in the back is the condense water drain pipe connected to it. When you remove the unit, it should slide out nicely. When reinstalling, make sure that you don’t forget to connect it, otherwise your drain water will flow on your passenger’s feet…
If it’s not sufficient to remove only the glove box and the knee pad, then you need to remove the whole dashboard. Whenever I uninstalled my A/C inside unit – OK, it didn’t happen that often, just 3-4 times – I had the dash off. The dash removal is a big job. You start with the tape holder, which is the middle arm rest. It is held by 4 screws. Then you remove the ashtray and there are 2 screws underneath. Then remove shift knob, any switches of rear wipers, electric mirrors, hardtop/targa. Then remove radio if installed, then all heating knobs and slides. Then comes the heating panel, it is held by 2 screws from the bottom, which you can access once the radio is gone. Underneath are 2 screws holding the heating slides in place, remove the screws. Then proceed with the gauge + A/C switch panel, it is held by 2 screws on the top. Remove then the loudspeaker grid from middle of the dash by simply pulling it out and remove the nut behind it, holding the dash in place. Then remove the 2 screws holding the middle console to the dashboard (you will see them behind the just removed gauge panel) plus the other 2 that hold it to transaxle housing. When you sit in the car, they are at about your knees. Remove steering wheel and stalks. Remove instruments, which are held by 2 screws accessible from the top of instrument frame in front of the RPM gauge and the multi instrument. Do not try to drill holes between the instruments, the small screw-cover-looking things are no screw covers! Once steering wheel removed, look simply from underneath, you will see the 2 screws. Then remove A-column covers, each are held by 3 screws that are covered. Behind these covers you will see 1 screw on each side, holding the dashboard, remove them. Now your dash is held by 1 screw on each side, on the left it is next to the top fuse board, which you might have to remove, on the right it is below the A/C relays.
Once dashboard off, you can easily remove the A/C unit. The expansion valve sits in the piping in one of the corners, thus you will have to completely dismantle the unit.
I wonder if Clark’s garage has a description, I should have looked first, but now that I already typed it in, I will not delete it