Checking the Refrigerant

sb mm 83.02.003

If equipped with a moisture indicator sight glass, check the color of the moisture indicator. See Fig., Item 1.

If the moisture indicator is a deep cobalt blue, the refrigerant charge is dry. If the indicator is not blue, the system is contaminated with water; recover the refrigerant, replace the receiver-drier, evacuate the system, and add a full refrigerant charge. Follow the instructions in General Information, Cummins ISB Series Engine of the Shuttle Bus Chassis Workshop Manual, or take the vehicle to an authorized Freightliner dealer.

  1. Moisture Indicator Sight Glass

  2. Receiver-Drier Sight Glass

Fig. 1, Receiver-Drier

Note:
Parent topic: Air Conditioner Checking, R-134a Refrigerant System
Document Number: 0000119865
Manual Publication Date: 2025-01-08
Topic Publication Date: 2025-01-08