- The required cooling output is not attained in the heater and A/C unit evaporator (and in the evaporator for battery cooling).
- The high pressure does not increase or only increases slightly above pressure with engine stopped.
- The low pressure does not drop or drops only slightly.
|
| Possible causes for the deviation from specified value and their solutions |
- No activation of the A/C compressor. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding"
function.
- If equipped, the refrigerant shut-off valve 1 is faulty (closed)
-- Check the activation and function of the A/C compressor (and the refrigerant shut-off valve 1, the refrigerant shut-off valve 2). Use the Vehicle Diagnostic Tester in the"Guided Fault Finding"
function of the A/C compressor and the battery regulation. If no malfunction can be determined replace the expansion valve on the evaporator in the heater and A/C unit. Refer to Refrigerant Circuit
.
- Constriction or obstruction in refrigerant circuit (for example, inside the refrigerant line between the service connection "low pressure side" and the A/C compressor).
-- If there is a blockage clean the refrigerant circuit (flush with refrigerant R1234yf). Refer to REFRIGERANT CIRCUIT, CLEANING
. Replace the expansion valve for the evaporator in the A/C unit (and for the evaporator for battery cooling) as well as the desiccant bag/dryer cartridge (or receiver/receiver/dryer). Refer to COMPONENTS, REPLACING
and Refrigerant Circuit
.-- If the hose or pipe is kinked or constricted, replace this component. Refer to Refrigerant Circuit
.
-- Replace the A/C compressor. Refer to COMPONENTS, REPLACING
and A/C Compressor
. |
| Final Procedures |
| -- Charge the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, CHARGING
.-- Repeat the test. Refer to ELECTRICALLY-DRIVEN A/C COMPRESSOR, CHECKING PRESSURE WITH A/C SYSTEM SWITCHED ON . |