GM Service Manual Online
For 1990-2009 cars only

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
  4. Disconnect the low pressure switch electrical connector.
  5. Remove the low pressure switch from the accumulator.
  6. Remove the O-ring seal.

Installation Procedure

  1. Install the new O-ring seal to the switch. Refer to O-Ring Replacement .
  2. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 769773  Size: SH
  3. Install the air conditioning (A/C) low pressure switch to the accumulator.
  4. Tighten
    Tighten the switch to 4 N·m (35 lb in).

  5. Connect the low pressure switch electrical connector.
  6. Install the air cleaner. Refer to the appropriate procedure:
  7. •  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
  8. Install the right wheelhouse panel. Refer to Wheelhouse Panel Replacement .
  9. Leak test the fittings of the component using the J 39400-A .