Tools Required

J 39400-A Halogen Leak Detector

1. Remove the right wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
2. Remove the air cleaner. Refer to the appropriate procedure:

•	Air Cleaner Replacement in Engine Controls - 7.2L (Caterpillar)

•	Air Cleaner Replacement in Engine Controls - 8.1L

•	Air Cleaner Replacement in Engine Controls - 7.8L

•	Caterpillar® 3126 Unit Repair Manual




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

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

Notice: Refer to Fastener Notice in the Preface section.




2. Install the A/C low pressure switch to the accumulator.

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:

•	Air Cleaner Replacement in Engine Controls - 7.2L (Caterpillar)

•	Air Cleaner Replacement in Engine Controls - 8.1L

•	Air Cleaner Replacement in Engine Controls - 7.8L

•	Caterpillar® 3126 Unit Repair Manual

5. Install the right wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
6. Leak test the fittings of the component using the J 39400-A .