- 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 pipe corresponds to the specified value
- The low pressure corresponds to the specified value or is too low
|
| Possible causes for the deviation from specified value and their solutions |
- The activation of the A/C compressor and if equipped the refrigerant shut-off valve 1 the refrigerant shut-off valve 2 is faulty. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding"
function for the A/C system and the battery regulation.
-- Check the activation and function of the A/C compressor (and if equipped the refrigerant shut-off valve 1 and the refrigerant shut-off valve 2) and if necessary service. Use the Vehicle Diagnostic Tester in the"Guided Fault Finding"
function of the A/C compressor and the battery regulation. If this is OK extract refrigerant from the refrigerant circuit.
- There is too little refrigerant in the refrigerant circuit.
-- Extract refrigerant from the refrigerant circuit. Refer to REFRIGERANT CIRCUIT, DISCHARGING
.-- If the extracted refrigerant quantity is significantly less than the specified capacity (more that 100 g (3.5 oz)). Refer to Technical Data
, and look for leaks and correct. Refer to LEAKS, FINDING
.-- If the extracted refrigerant quantity corresponds to the specified capacity or is only slightly smaller (less than 100 g (3.5 oz)). Refer to Technical Data
and Technical Data
. Check the refrigerant shut-off valve for function. Refer to the Refrigerant Circuit
.
- The expansion valve for the evaporator in the heater and A/C unit is faulty. Refer to Refrigerant Circuit
.
- A refrigerant shut-off valve is faulty (closed). Use the Vehicle Diagnostic Tester in the"Guided Fault Finding"
function for the A/C system and the battery regulation. Refer to Refrigerant Circuit
.
-- If equipped check the function of the installed shut-off valve. Refer to Refrigerant Circuit
.-- Replace the expansion valve for the evaporator in the heater and A/C unit. Refer to Refrigerant Circuit
.
- Too much refrigerant oil in the refrigerant circuit
-- 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
. |
| 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 . |