so is there a magic number for all a/c systems that the air coming from the vents dont get any colder? Say can a mercedes blow out 38 degree temps and a ford blow out 20 degree temps only because the ford has a better design or would they both just reach maximum cooling at the same temp?

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual