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Which A/C line is SUCTION; smaller one connects to front side? Or back center?

(1999 Saturn SL2)
in Plano, TX on July 17, 2015
this is a 5 speed, 4 door. Center line connected to back end appears to be larger. Neither line is marked nor are the protective caps.
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Popular Answer
on July 17, 2015
google these part numbers,look at the difference.
Part Number: 56467 Suction Line
Part Number: 55792 Discharge Line
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