Adding AC System

The pros and cons of those under dash units...
They can be noisey even with a good fan motor.
They can drip cold water on your accerator foot even with a condensate drain.
They can be attached to a piece milled under hood set up.
With r12 freon they can blow snow flakes out the vents and make your left leg ache with ice cold air.
With todays 134A freon, their clamped hoses cant hold the pressures required to get air that cold but still a heck of a lot better than no a/c
Bottom line ... I would install it with the piece milled under hood components rather than spend a mint on the factory correct stuff which includes old school compressor designs.