Inspection of the Air Conditioner

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. Inspect the refrigerant compressor drive belt for damage. If needed, replace the drive belt.
5. 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).
6. 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 Section 83.02, Subject 140 of the 108SD and 114SD Workshop Manual. If the compressor does not turn freely, replace the compressor. For instructions, see Section 83.02, Subject 120 of the 108SD and 114SD Workshop Manual.
7. Use a feeler gauge to check that the drive plate clutch clearance is 0.016 to 0.031 inch (0.4 to 0.8 mm). Check the gap at three equally spaced locations on the drive plate, and average the measurements to account for pulley misalignment. If the overall gap is out of spec, remove the drive plate assembly and change the shims as necessary. For instructions, see Section 83.02, Subject 140 of the 108SD and 114SD Workshop Manual.
8. Check that the wiring harness connector is not damaged or loose. Replace the wiring harness if it is damaged.
9. Check the overall condition of the air conditioning hoses. Look for cracks, cuts, and abrasions on the hoses. Replace damaged hoses.
10. 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.