I would like to add something here. I understand that the R12 replacements, which I assume this is, are explosive.
You would think that being explosive inside your air conditioner would not be a big deal, and maybe it isn't. But what if a compressor locked up and made a spark?
juan, I live in Texas myself and know how frustrating it is to deal with this R12 problem. I also know how brutal the heat can be, but I think you need to either "bite the bullet" and go for R12 or convert to R134.
I hate to get political, but I believe that our congressmen should have had to live in Houston, Texas in August with no air conditioning for about a month before voting on the bill that outlawed R12.
Good luck juan,
'84 Euro 240D, 516K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in