I've noticed a couple on a/c lines that branch off from the low side line not too far from the service port that run somewhere into the inner workings of the engine compartment. Does anyone know what these lines go to or why they are there? Thanks

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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