Peugeot 308: Checking : Air conditioning circuit
ESSENTIAL : Observe the safety and cleanliness recommendations
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ESSENTIAL : All personnel carrying out work on a vehicle fitted with traction batteries must have received specific electric vehicle training and be authorised to work on these vehicles (observe the regulations in force in the respective country).
1. Tooling
Workshop equipment : Recovery/filtering/vacuum extraction/charging equipment.
| tool | Reference | Description |
| [EXXO-CLIM] | kit : Pressure regulator |
| [4372-T] | CLIM test 2 VALEO 4372-T |
2. Checking procedure
Fit tool [EXXO-CLIM] or [4372-T] (in accordance with the manufacturer’s instructions).
Perform the following operations :
- Close all the front air vents
- Start the engine
- Open the front left-hand air vent
Set the air distribution controls to the central and side air vents.
To start the outside air circulation function : (Recirculation off).
To start the air conditioning function (AC on).
Set the air flow control to maximum.
Set the passenger compartment temperature control to minimum (Max. cold).
Operate the air conditioning for 5 minutes.
3. Interpretation of the values (reminder)
N.B. : Values related to the use of tool CLIM Test 2 from VALEO and integrated into tool [EXXO-CLIM].
3.1. Undercooling (SR)
The under-cooling represents the difference between the condensation temperature and the refrigerant temperature at the air conditioning condenser outlet.
The under-cooling indicates the quantity of refrigerant (in liquid state) in the air conditioning circuit.
| Undercooling (SR) | Causes | Solutions |
| Less than 2°C | Lack of refrigerant in the air conditioning condenser : Greater than 150 grammes | Add refrigerant ; Using the filling and recycling station |
| Between 2°C and 4°C | Lack of refrigerant in the air conditioning condenser : Between approximately 100 and 150 grammes | |
| Between 4°C and 12°C | Correct charge | - |
| Higher than 12°C | Excess of refrigerant in the air conditioning condenser | Remove refrigerant ; Using the filling and recycling station |
| Higher than 15°C |
3.2. Over-heating
The over-heating represents the difference between the refrigerant temperature at the evaporator outlet and the evaporation temperature.
The over-heating indicates the quantity of refrigerant (in gaseous state) in the air conditioning circuit.
| Over-heating | Causes | Solutions |
| Between 2°C and 15°C | Correct charge | - |
| Higher than 15°C | Lack of refrigerant in the air conditioning circuit | Add refrigerant ; Using the filling and recycling station |
| Less than 2°C | Excess refrigerant in the air conditioning circuit | Remove refrigerant ; Using the filling and recycling station |
3.3. Temperature of the blown air "u"
The temperature of the blown air should be between 2°C and 10°C.
4. Air conditioning circuit diagnostics table (as a guide)
| Main failure | Symptom | Possible causes |
| The air conditioning compressor does not operate or stops quickly | The air conditioning compressor clutch does not engage or disengages quickly | Refrigeration compressor clutch |
| Lack of refrigerant in the air conditioning circuit | ||
| Air conditioning pressure switch | ||
| Air conditioning evaporator | ||
| Electrical circuit (connectors, fuses,....) | ||
| The air conditioning compressor clutch remains engaged and stops quickly | Ancillary drive belt | |
| air conditioning compressor | ||
| Filtering and drying cartridge | ||
| Air conditioning pressure relief valve | ||
| Refrigerant leak | ||
| Refrigeration compressor clutch | ||
| The air conditioning compressor makes an abnormal noise | The air conditioning compressor clutch remains engaged | Air conditioning compressor clutch setting incorrect |
| Refrigerant fluid charge | ||
| Air conditioning compressor faulty | ||
| Lack of refrigerant in the air conditioning circuit | ||
| Air conditioning compressor valves faulty | ||
| The air conditioning compressor clutch remains engaged and slips | Air conditioning compressor clutch | |
| Ancillary drive belt | ||
| Abnormal pressure values | Low pressure and high pressure too high | Air conditioning pressure relief valve faulty |
| Pipe clogged | ||
| Low pressure too high and high pressure too low | Air conditioning compressor seal faulty | |
| Low pressure too low and high pressure too high | Air conditioning evaporator | |
| Air conditioning pressure relief valve jammed | ||
| Filtering and drying cartridge blocked | ||
| Pipe clogged | ||
| Low pressure and high pressure too low | Pipe clogged | |
| Air conditioning pressure relief valve jammed | ||
| Lack of refrigerant in the air conditioning circuit | ||
| Air conditioning compressor faulty | ||
| Low pressure normal and high pressure too high | Presence of air in the air conditioning circuit | |
| Low pressure normal and high pressure too low | Air conditioning pressure switch faulty | |
| Air conditioning evaporator | ||
| Low pressure too high and high pressure normal | Air conditioning pressure relief valve jammed open | |
| Low pressure too low and high pressure normal | Filtering and drying cartridge saturated or clogged | |
| Air conditioning pressure relief valve iced up | ||
| Operation of the air conditioning in down-grade mode | Under-cooling too low | Lack of refrigerant |
| Under-cooling too high | Excess of refrigerant | |
| Presence of air in the air conditioning circuit | ||
| Filtering and drying cartridge clogged |
N.B. : In all cases, measure the over-heating and the blown air temperature.
Peugeot 308 2021-2025 (P5) Service Manual
Actual pages
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