GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Air Conditioning Cycling Switch Replacement

Special Tools

J 39400-A Halogen Leak Detector

Removal Procedure
  1. Remove the right wheelhouse panel. Refer to Wheelhouse Panel Replacement.
  2. Remove the air cleaner. Refer to the appropriate procedure:
    3. •  Air Cleaner Element Replacement for the 6.6L engine
    •  Air Cleaner Replacement for the 8.1L engine
    •  Air Cleaner Replacement for the 7.8L engine
    •  Air Cleaner Replacement for the 7.2L engine

    Object Number: 769773 Size: SH
  3. Disconnect the low pressure switch electrical connector.
  4. Remove the low pressure switch from the accumulator.
  5. Remove the O-ring seal.

Installation Procedure
  1. Install the new O-ring seal to the switch. Refer to O-Ring Replacement.

    2. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 769773 Size: SH
  2. Install the air conditioning (A/C) low pressure switch to the accumulator.

    3. Tighten
    Tighten the switch to 4 N·m (35 lb in).

  3. Connect the low pressure switch electrical connector.
  4. Install the air cleaner. Refer to the appropriate procedure:
    5. •  Air Cleaner Element Replacement for the 6.6L engine
    •  Air Cleaner Replacement for the 8.1L engine
    •  Air Cleaner Replacement for the 7.8L engine
    •  Air Cleaner Replacement for the 7.2L engine
  5. Install the right wheelhouse panel. Refer to Wheelhouse Panel Replacement.
  6. Leak test the fittings of the component using the J 39400-A .