89 buick century a/c woes

i have flushed the a/c system, replaced compressor, accumulator, orifice tube, seals, and charged the system with the suggested R-134a amount (r-12 - 15%). I have something strange that happens with the a/c....when i turn
corners in the car, it actually blows colder air,,,Anyone ever heard of that,, and if so what the heck is the deal???

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