I have a 2004 Mazda 3 without air, can I have the A/C system installed?

I doubt if an aftermarket ac company would have a kit suitable for cars as new as your 3. I don't think they are a dealer add now, ac was a dealer add on about 20-25 years ago for most imports. Talk to your dealer to see if there are some options, also talk to someone like classic air and see what they can do. Another option would be to buy a complete ac system from a wrecked car in a salvage yard. After checking these options you may find it's best and perhaps cheaper to sell your car and buy one with ac. My 2 cents.

Clifton

Thanks for the reply. I had been bouncing those options around in my head.