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80 degrees ?? JEEZ!!!
Rule of thumb for R-134a is 80% of the original R-12 capacity. So if the system took 2 pounds (32 oz) of R-12, then install 25 ounces of R-134a. New systems designed for R-134a will state how much refrigerant to install. R-134a runs at a higher pressure and temp than R-12 so don't overfill.

Vintage Burgundy 1966 Mustang GT Fastback
MCA member #46447
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