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low port to recharge A/C on '96 5.7L Vortec?

Discussion in 'Truck & Equipment Repair' started by mak, Jun 16, 2007.

  1. mak

    mak Junior Member
    Messages: 17

    I see two ports right off the compressor how do I know which one is the low side? Thanks for the help.
  2. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    A repair manual should tell you which side is the low side. I f you don't have one, try the library. I looked at my manuals and they don't say how to figure out which line is the low side. It's been a while since I had to charge a system.
  3. stangman35

    stangman35 Senior Member
    Messages: 267

    The larger of the two lines is the lowside.
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    The a/c line thats comes out of the compressor that runs back toward the firewall and connects to the accumulator (mounted on the pass side of the firewall) is the low pressure suction side on the Vortec trucks.