R134a Red or Blue Orifice Tube
I did a quick conversion on my AC system last year. Just grabbed a conversion kit from Autozone and put it in. I did not change the receiver dryer, orifice tube or draw a vacuum on the system. It worked OK, but the charge leaked out by this year. At the begining of the summer I refilled but it has leaked down and I had to top it off already. We've got another month or so of 100 plus, so I'm going to go ahead and do it right.
The compressor was changed over a few years back (6-7) and is rated for
R12 or 134A. I picked up a cheap venturi vacuum pump ($9) and gauge set ($39) from Harbor Freight. I know they are not the best, but will work for me. I am going to do it right and put in a new Receiver Dryer, change the O-Rings and Orifice Tube. My question is this (and yes I searched) which color of Orifice Tube do I use? Red, Blue, or the cheap variable one from Checker? I know a smaller size is recomended for a conversion. For GM conversions they recomend using a Ford blue Orifice Tube, but the red is slightly smaller. Right now I plan on using the red. Does anyone have any experience, or does it matter? My Bronc is an '89 with a 302.
Thanks in advance!