- 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 substantially smaller (more than 100 g) than the specified capacity. (refer to Technical Data
(vehicle-specific Service Information), there is too much refrigerant in the refrigerant circuit. Refer to LEAKS, FINDING
.-- If the extracted refrigerant quantity corresponds to the capacity or is only slightly smaller (maximum 100 g). (refer to Technical Data
(vehicle-specific Service Information)) check the expansion valve and shut-off valve for function. Refer to Refrigerant Circuit
(vehicle-specific Service Information).
- The expansion valve for the evaporator in the heater and A/C unit is faulty. Refer to Refrigerant Circuit
(vehicle-specific Service Information).
- A Refrigerant Shut-Off Valves -- is faulty (closed), check the function. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"
function for the A/C system and the battery regulation and refer to Refrigerant Circuit
(vehicle-specific Service Information) for replacing.
-- If equipped, check the function of the installed shut-off valve. Refer to Refrigerant Circuit
(vehicle-specific Service Information).-- Replace the expansion valve for the evaporator in the heater and A/C unit. Refer to Refrigerant Circuit
(vehicle-specific Service Information).
- Constriction or blockage in the refrigerant circuit (for example in the refrigerant line between the "low pressure side" service connection and the A/C compressor). Refer to Refrigerant Circuit
(vehicle-specific Service Information).
- Activation of the A/C compressor is malfunctioning. 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 service. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"
function of the A/C system and the battery regulation. If not error can be determined run hand over refrigerant circuit to check for differences in temperature. Refer to Refrigerant Circuit
(vehicle-specific Service Information).-- If difference in temperature is found at one component: If the hose or pipe is kinked or constricted, replace this component and replace a faulty expansion valve. Refer to Refrigerant Circuit
(vehicle-specific Service Information). If there is a blockage clean the refrigerant circuit (flush with refrigerant R1234yf). Refer to REFRIGERANT CIRCUIT, CLEANING
.-- 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 heater and A/C unit (and for the evaporator for battery cooling) as well as the desiccant bag/dryer cartridge (or reservoir/receiver/dryer). Refer to COMPONENTS, REPLACING
and Refrigerant Circuit
(vehicle-specific Service Information). |