how to add air condition in my vw beetle 1970

Hello, I do not think it is possible to do so using the current vents and pipes unless it was already installed. If it was, it will still be expensive to do so. If you want another opinion, you may want to try these folks: http://www.classicvws.com/ravi.htm Best of luck! CarGrrl

If it did not come with A\c it may be possible to get an underdash unit installed. I priced one many years ago for my old Corolla and at that time it was $1200...I decided it wasn't that hot.