JOEZ33
Well-Known Member
- Joined
- February 22, 2008
- Messages
- 152
- Reaction score
- 2
- City, State
- The PIZZEL, FL
- Year, Model & Trim Level
- 98 Eddie Bauer
I work in aviation and we still use R12 on a daily basis. So it's available with no problem. I live in a pretty frikin hot environment and the colder the AC the better. I decided to upgrade to R12 in my 98 explorer.
I removed the R134a with our 134 machine, then filled with R12. Normally when doing a 12 to 134 conversion you use only 80% of the old amount of freon, so a 1 lb R12 system gets refilled with .8 LB of R134. I did the math in reverse and appropriately filled slightly more R12 than the under hood sticker.
My problem is that the orifice tube is allowing too much volume to pass through it, and I'm not getting much of a pressure split between low and high sides. I'm only getting 125 psi high side and 30 psi low side, and it constantly freezes up unless I run the blower at full blast. When I add more freon its not as cold, then suddenly freezes up on the highway again.
My question is whether they make other orifice tubes that are more restrictive, maybe from older R12 trucks. If so, what's the part number?
I removed the R134a with our 134 machine, then filled with R12. Normally when doing a 12 to 134 conversion you use only 80% of the old amount of freon, so a 1 lb R12 system gets refilled with .8 LB of R134. I did the math in reverse and appropriately filled slightly more R12 than the under hood sticker.
My problem is that the orifice tube is allowing too much volume to pass through it, and I'm not getting much of a pressure split between low and high sides. I'm only getting 125 psi high side and 30 psi low side, and it constantly freezes up unless I run the blower at full blast. When I add more freon its not as cold, then suddenly freezes up on the highway again.
My question is whether they make other orifice tubes that are more restrictive, maybe from older R12 trucks. If so, what's the part number?