What do I need to retrofit my AC to R-134a?
R-134a, adapter hose, new R-134a service port adapters, retrofit label, new schrader valves), a third 12 oz. can of R-134a (for a grand total of 40oz.), a large bore schrader valve and valve removal tool, Snap ring pliers (if replacing the compressor), safety goggles and maybe gloves, and a normal assortment of metric and standard wrenches/sockets.
What’s the difference between R-12 and R-134a?
One key to the use of R-134a is the amount to use. At a given temperature, R-134a will have a higher pressure than R-12. Therefore, you must use LESS R-134a in your system than you would R-12. The formula is this: R-12 amount x 90% – 1/4 lb. = R-134a amount. In the F-body system, 48 ounces of R-12 are used (3 pounds). Thus, applied to the formula:
Can a R-134a air conditioner hose be replaced?
As it turns out, R-134a has a smaller molecular structure, and can seep out through older hoses. If your hoses are in bad shape, you might think about replacement, otherwise its not recommended as necessary. If it leaks out, it will be slowly, and an R-134a recharge is so cheap it’s not a big deal.
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How to retrofit R12 to R134a by classic auto air?
R12 Recovery – Recover refrigerant from the A/C system using a dedicated R12 recovery device (to SAE J1990). R12 Parts replacement – Remove the components to be replaced as part of the retrofit to R134a, as recommended by the A/C system or vehicle manufacturers guidelines. Add 30-50ml PAO oil to a/c system. Retrofit warning labels.