FixVault

Compressor Operation Test

WARNING: This page is about a different car, the 1996 Oldsmobile LSS, 1996 Oldsmobile Eighty-Eight, and 1996 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Compressor operation test measures compressor current draw, compressor output and pressure leak-down.
  1. Disconnect pressure line from air dryer. Connect Pressure Gauge (J-22124-B ) to air dryer. See Fig 1 . Disconnect compressor connector. Connect Black wire of compressor connector to ground. Install ammeter between Dark Green wire of compressor connector and a 12-volt power source. See Fig 1 . Note compressor motor current draw.
  2. If compressor does not operate or current draw exceeds 14 amps, replace compressor assembly. If current draw is 14 amps or less, allow pressure to reach 100 psi (7.0 kg/cm2 ) and disconnect power supply.
    NOTE: If compressor is allowed to run to maximum output pressure of 180 psi (12.7 kg/cm2 ), exhaust solenoid valve will act as a relief valve. This gives a false indication of system leakage.
  3. If pressure holds at 100 psi (7.0 kg/cm2 ), compressor is okay. If pressure decreases to less than 60 psi (4.2 kg/cm2 ), but does not continue to decrease, replace compressor head assembly. If pressure completely leaks off, or builds up but does not reach 100 psi (7.0 kg/cm2 ), check compressor for leaks. See COMPRESSOR LEAK TEST  .
Fig 1: Testing Compressor Operation
G91H11327Courtesy of GENERAL MOTORS CORP.