Refrigerant System - Testing

TESTING THE REFRIGERATION SYSTEM

The high pressure service port uses a two piece valve which is a primary seal and should not leak any refrigerant even with the cap removed. When refrigerant pressures on the high side are checked, the high side gage hose will directly connect to the port.

If a malfunction in the refrigeration system is suspected (due to abnormal system pressures), refer to "ELECTRONIC CLIMATE CONTROL", and check the following items:

1. Check outer surfaces of the radiator and condenser cores to be sure that 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. Clean as required.
2. Check for restrictions or kinks in the evaporator and condenser cores, hoses, tubes, etc. Replace as required.
3. Check for refrigerant leaks.
4. Check all air ducts for leaks or restrictions. Low air flow rate may indicate a restricted or frozen evaporator core. Repair as required.
5. Check for compressor clutch slippage. Check compressor clutch coil current (3 to 6 amps) or resistance (3 to 5 Ohms) and compressor clutch operation. Repair or replace as necessary.
6. Check for proper blower fan operation.
7. Check for improper serpentine drive belt tension or excessive wear. Adjust or replace as required.
8. Check for a plugged accumulator or expansion tube. Clean or replace as required.
9. Check for excessive moisture in the refrigerant system. Replace the accumulator.
10. Check for excessive oil in the refrigeration system. Drain and replace with new PAG refrigerant oil. refer to "Refrigerant Oil Distribution". Replace refrigerant oil and charge the ECC system.