Inspection Of The Air Conditioner

4700 mm 83.01.001

    Warning: Wear eye protection, gloves, and protective clothing when working on the air conditioning system. Leaking refrigerant from a damaged hose or line could cause blindness or serious skin burns.

  1. Park the vehicle on a level surface, apply the parking brake, and chock the tires.
  2. Inspect the A/C compressor hub. A torn or melted rubber dampener (center section) indicates internal damage has occurred within the compressor. Inspect friction surfaces for wear, oil-soaked conditions, or discoloration due to excessive heat.
  3. With the belt removed, check to make sure that the rotor (pulley) spins freely. It should not wobble or contact the hub when it is spinning. Using a feeler gauge, check the clearance between the rotor and hub at several locations, and average the results. See Fig.. See Table. for acceptable clearances. For a Denso compressor, if the clearance is greater than 0.024 inch (0.6 mm), replace the clutch. For instructions, see Section 83.04, Subject 140 of the Western Star Workshop Manual. For a Sanden compressor, if the drive plate clutch needs adjustment, see Section 83.01, Subject 130 of the Western Star Workshop Manual. For a Climate Control compressor, if the clearance is 0.035 inch (0.89 mm) or greater, replace the clutch. For instructions, see Section 83.00, Subject 140 of the Western Star Workshop Manual.

    See Table. for acceptable clearances.

    • Clearance

    1. Fill Port Plug (Optional)

    2. Return Fuel Heating Loop

    Fig. 1, Hub/Rotor Clearance

    Table 1, Acceptable Compressor Clutch Clearances

    Acceptable Compressor Clutch Clearances

    Compressor

    Acceptable Clearance: inch (mm)

    Denso

    0.014 to 0.024 (0.35 to 0.6)

    Sanden

    0.016 to 0.031 (0.40 to 0.78)

    Climate Control

    0.020 to 0.030 (0.50 to 0.76)

      Table 1, Acceptable Compressor Clutch Clearances

    1. Check the overall condition of the air conditioning hoses. Look for cracks, cuts, and abrasions on the hoses. Replace damaged hoses. Also check for signs of loose fittings on all of the air conditioning components.
    Note:
    Parent topic: Heater and Air Conditioner
    Document Number: 0000121103
    Manual Publication Date: 2024-05-23
    Topic Publication Date: 2024-10-31