If the radiator fan is not working, the car's air conditioning (AC) system may still function, but its performance will be significantly affected, especially at low speeds or when the vehicle is idling.
Here's how the malfunctioning radiator fan impacts the AC system
1. Reduced Cooling Efficiency
The AC condenser (located near the radiator) relies on airflow to cool the refrigerant. When the car is moving, natural airflow through the front of the car helps cool the condenser. However, when the vehicle is stationary or moving slowly, the radiator fan is crucial in providing that airflow.
Impact: Without a working fan, the condenser may not dissipate heat effectively, causing the AC to blow warmer air, especially when the car is stopped or in traffic.
2. Overheating Risk
The radiator fan also helps cool the engine. If the fan isn't working, the engine might overheat, particularly when the AC is running because the AC puts extra load on the engine.
Impact: Overheating could cause the AC system to shut down as a protective measure or lead to more serious engine damage.
3. High Pressure in AC System
Without proper cooling from the fan, the AC system's pressure can increase due to excessive heat in the condenser. This might trigger the system's high-pressure switch, which can shut off the AC compressor to prevent damage.
Impact: The AC may intermittently stop working or not engage properly at all.
4. AC Performance at Higher Speeds
At higher speeds, the car generates natural airflow through the condenser and radiator, allowing the AC to work reasonably well even without the fan.
Impact: While driving at higher speeds, the AC may still produce cool air, but once the car slows down or stops, the cooling efficiency will drop due to lack of airflow from the fan.