Inspection of the Refrigerant Compressor

m2+ m 83.01.000
  1. With the vehicle parked on a level surface, apply the parking brakes and chock the tires.
  2. Operate the heater and, if equipped with an air conditioner, the air conditioner to check for proper operation in all modes.
  3. Open the hood.
  4. Check the condition of the refrigerant compressor clutch assembly. If the friction surface of the pulley shows signs of excessive grooving due to belt slippage, replace both the pulley and the drive plate.
  5. Inspect the refrigerant compressor drive belt for damage. If needed, replace the drive belt.
  6. Check the tightness of the compressor mounting fasteners. The torque value for the mounting fasteners is 15 to 19 lbf·ft (20 to 26 N·m).
  7. Inspect the drive plate. If the friction surface of the drive plate shows visible signs of damage due to excessive heat, make sure the refrigerant compressor turns freely. If the compressor does turn freely, replace the drive plate and clutch assembly. For instructions, see  of the Business Class® M2 Plus Workshop Manual. If the compressor does not turn freely, replace the compressor. For instructions, see  of the Business Class M2 Plus Workshop Manual . 
  8. Use a feeler gauge to check that the drive plate clutch clearance is 0.012 to 0.024 in (0.3 to 0.6 mm). If the gap is not even around the clutch, gently tap down at the high areas. If the overall gap is out of spec, remove the drive plate assembly and change the shims as necessary. For instructions, see  of the Business Class M2 Plus Workshop Manual .
  9. Check that the wiring harness connector is not damaged or loose. Replace the wiring harness if it is damaged.
  10. Check the overall condition of the air conditioning hoses. Look for cracks, cuts, and abrasions on the hoses. Replace damaged hoses.
  11. Check for a buildup of road debris on the condenser fins. Using air pressure and a whisk broom or a soapy spray of water, carefully clean off the condenser. Be careful not to bend the fins.
  12. Check the moisture indicator on the receiver-drier. See Fig.. If the indicator is a deep cobalt blue, the refrigerant charge is dry. If the indicator is not blue, the system is contaminated with water. If the system is contaminated, recover the refrigerant, replace the receiver drier, evacuate the system, and add a full refrigerant charge. For instructions, see  of the Business Class M2 Plus Workshop Manual .
  13. Close the hood and remove the chocks from the tires.

    1. Fan Cycling Switch

    2. Moisture Indicator

    3. Binary Switch

    4. Receiver-Drier

    Fig. 1, Receiver-Drier

Note:
Parent topic: Heater and Air Conditioner
Document Number: 0000121052
Manual Publication Date: 2025-02-11
Topic Publication Date: 2024-11-06