DESCRIPTION

The A/C high pressure switch (1) sends a signal to the engine control module (ECM) to control A/C compressor clutch engagement/disengagement and, controls electric cooling fan operation when equipped with the 2.8L diesel engine. The A/C high pressure switch is mounted on a fitting located on the A/C discharge line near the A/C compressor. The ECM will disengage the A/C compressor clutch if the refrigerant system pressure exceeds 3100 - 3375 kPa (450 - 490 psi).

The fitting for the A/C high pressure switch on the A/C discharge line is equipped with an O-ring seal and contains a Schrader-type valve, which allows the switch to be serviced without discharging the refrigerant system.