Functional Test
FUNCTIONAL TEST1. Operation of the air conditioning blower at all speeds with the (mode) lever in any position except "OFF" and engagement of the compressor clutch would indicate that the electrical circuits are functioning properly.
2. The same HAND-FELT temperature of the evaporator inlet pipe and the accumulator surface of an operating system would indicate a properly charged system.
3. Operation of the A/C control selector to distribute air from the designed outlets would indicate proper functioning.
SYSTEM INSPECTION
- If a malfunction in the refrigerant system is suspected, check the following:
CHECKS
1. Outer surfaces of radiator and condenser cores to be sure air flow is not blocked by dirt, leaves or other foreign material. Be sure to check between the condenser and radiator as well as the outer surfaces.
2. Restrictions or kinks in the condenser core, hoses, tubes, etc.
3. Blower fan operation.
4. Refrigerant leaks.
5. All air ducts for leaks or restrictions. Low air flow rate may Indicate a restricted evaporator core.
6. Compressor clutch slippage.
7. Improper drive belt tension.
8. Plugged accumulator or expansion (orifice) tube.
9. Excessive moisture in the refrigerant system.
10. For compressor/system diagnostic procedures refer to charts under Insufficient Cooling. Symptom Related Diagnostic Procedures
11. Cooling fan for normal operation.
12. Coolant thermostat for normal operation.