What are the reasons for the Peugeot 307 air conditioning not cooling?
2 Answers
The reasons for the Peugeot 307 air conditioning not cooling are as follows: 1. Clogged air filter: This issue is often overlooked by many new drivers, replace the air filter. 2. Dirty condenser, poor heat dissipation: The condenser is prone to accumulating dust and small insects. If not cleaned for a long time, the condenser's heat dissipation will be poor, and the air conditioning cooling effect will significantly decrease. You can clean the dirt on the condenser by rinsing it with water, but be careful not to use too high water pressure as the condenser is quite fragile. 3. Cooling fan not working: A non-working cooling fan greatly affects the condenser's heat dissipation, so it should be repaired or replaced promptly. 4. Refrigerant pressure too high or too low: Refrigerant, also known as coolant, is the cooling agent inside the air conditioning system. There is a certain natural loss of refrigerant in the air conditioning system. If the refrigerant pressure is too low, the cooling effect will deteriorate, while if the refrigerant pressure is too high, the air conditioning may cool intermittently. Therefore, the refrigerant pressure must be adjusted to the standard range; neither too low nor too high is good. 5. Refrigerant leak: This situation is more troublesome as it requires the use of specialized equipment to locate the leak point inch by inch. Common leak points include the air conditioning pipelines, evaporator, and other components, requiring the replacement of related parts.
I've been driving my 307 for ten years and encountered AC cooling failures twice. The first time was due to the condenser being completely clogged with willow catkins—the gray radiator fins in front of the coolant tank were covered in fluff, causing the high-pressure pipe to scorch hot while blowing no cold air. The second time, the evaporator temperature sensor failed; the dealership's diagnostic showed erratic temperature readings, making the compressor cut out frequently. I recommend first cleaning the radiator mesh, then plugging in an OBD scanner to check for trouble codes—older French cars often throw sensor-related errors. Don’t forget to clean the cabin air filter during inspection; when dirty, it reduces airflow and impacts cooling efficiency.
