has anyone done this with success? what did it take to do it? parts/cost wise?

I was talking to a honduh tech and the just evac the old r12 and put in the r134a. thats it. no new oil or anything. just swap it out. i dont think this is correct. been planning it on weak a/c on the 4runner(1stgen) <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />


Gary S.
88 Runner SR5 V6