The low-side R12 port is always 1/4″ male flare thread. While the high-side is usually the same size as the low, in certain applications it could be a smaller 3/16″ male flare.
Are R12 and r134 fittings different?
There are a lot of differences between the R12 and the R134a fitting. If they left the R12 fittings on the converted R134a system, you can accidentally fill it with R12. One will not interchange with the other because the fitting is so far away from the function and operation.
Can R12 be replaced with R134a?
The compressor that is used in your older R12 system luckily will still work R134a refrigerant and still be just as efficient. The condenser and evaporator are simply heat exchangers so they also do not need to be changed to run a different refrigerant.
How do I know what size AC to fit?
A/C Hose size is determined by the inside and outside diameter of the hose. Outside diameters of hoses vary significantly and MUST NOT be used solely to determine hose size.
What happens if you put 134a in an R12 system?
Mixing R12 and R-134a refrigerants is illegal, and even if you previously bleed out the R12, the system has to be adjusted to use R-134a, or it will cause leaks, copper corrosion, and lack the lubrication required for optimal operation.
What is special about R12 hoses compared to R134a hoses?
The hose has an extra liner for higher pressure and to prevent leakage of the easy to leak out R134a. From what I understand the molecule is smaller for R134a thus it needs more of a barrier against leaking than the R12 hose has.
What refrigerant is compatible with R12?
There are three replacement refrigerant options for R12 systems: R134a, R401a, R401b. R134a is regarded, by manufacturers and adherents to the Montreal Protocols alike, as the best replacement refrigerant.
Can I use R22 gauges for R134a?
No, you cannot. To make a short story long, R410A and R22 are refrigerants. They are both good refrigerants and they both work, but they have to be charged in the system at different pressures. R410A is a higher pressure system and R22 is a lower pressure system.
Can you still buy R12 freon?
Anyone with the required EPA R-12 certification still can buy the 1-pound cans at auto-parts stores, but the cans are kept in the back and guarded like gold.
When was R12 outlawed?
By international agreement in 1987 (the Montreal Protocol), the use and production of CFCs such as R12 began to be phased out, with automobile manufacturers required to stop using it by the end of the 1994 model year.
How much does it cost to convert R12 to R134a?
If you have a professional convert the R12 to R134a, you may spend about $250 for the entire service. However, this is much more cost-effective than replacing the entire air conditioning system. If you were thinking about getting an R134a system installed, your cost would be around $2,000 to $4,000.
How do you size an fitting?
AN sizes range from -2 (dash two) to -32 in irregular steps, with each step equating to the OD (outside diameter) of the tubing in 1/16″ increments. Therefore, a -8 AN size would be equal to 1/2″ OD tube (8 × 1/16 = 1/2).
What size are auto AC hoses?
Hose, Air Conditioning, Automotive 5/16″
Parker is the industry standard for OEM automotive air conditioning hose.
What size are refrigerant hose fittings?
Hose Fittings: 1/4″ SAE Female.
