Functional Test/Check

Functional Test:

INSPECTION OF THE SYSTEM
^ If a malfunction in the refrigerant system is suspected, check the following:
1. Check 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 motor operation.
4. Refrigerant leaks.
5. Check 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 receiver dehydrator or thermal expansion valve.
9. Excessive moisture in the refrigerant system.
10. For compressor - see System Diagnostic Tests. Testing and Inspection
11. Cooling fan for normal operation.
12. Coolant thermostat for normal operation.
13. Temperature door for proper operation. Refer to System Diagnostic Tests. Testing and Inspection

FUNCTIONAL TEST
^ To help in determining whether or not the air conditioning, electrical, vacuum and refrigeration systems are operating properly, perform the following:
1. Operation of the air conditioning blower at all 4 speeds with the (mode) lever in any position except OFF and engagement of the compressor clutch will indicate that the electrical circuits are functioning properly. (The blower will not operate in any speed with the mode lever in the OFF position.)
2. Operation of the A/C control selector (mode) lever to distribute air from the appropriate outlets indicate proper operation. The system will default to air flow in several modes if a vacuum system malfunction exists.
^ Refer to A/C Functional Test Chart (see image) for further testing of operation.