Here's how it impacts the AC
1. Cooling the AC Condenser
The AC condenser is usually located in front of the radiator. It releases heat absorbed from the cabin air, and the radiator fan helps cool the condenser by pulling air through it.
Impact: If the radiator fan isn't working, the condenser won't cool effectively, which can reduce the efficiency of the AC. As a result, the AC may blow warm air instead of cold, particularly when the vehicle is not moving or at low speeds.
2. Airflow at Low Speeds and Idle
When your car is moving, natural airflow helps cool the condenser and radiator. However, when the car is stationary or moving slowly, the radiator fan is responsible for providing airflow.
Impact: If the fan fails, the AC system may not cool efficiently at idle or low speeds because the condenser will not receive enough airflow to release heat. The AC may work fine at higher speeds but struggle when stopped.
3. Prevention of AC System Overheating
The radiator fan helps to prevent the AC system from overheating. If the fan doesn't operate properly, the pressure in the AC system can rise too high, which may cause the AC compressor to shut off to prevent damage.
Impact: Without the fan cooling the condenser, the AC system may overheat, leading to intermittent cooling or total AC failure.
4. Automatic Fan Activation with AC
In most vehicles, the radiator fan is designed to turn on automatically when the AC is activated, even if the engine isn't hot enough to require cooling.
Impact: If the radiator fan does not turn on when the AC is engaged, it could indicate a faulty fan, relay, or control module, leading to poor AC performance.
5. Increased Engine Temperature
The AC system places an additional load on the engine, generating more heat. The radiator fan helps to manage both engine and AC temperatures.
Impact: If the radiator fan isn't working, the engine can overheat, which further affects the AC system's ability to function properly.
Signs of a Radiator Fan Problem Affecting the AC:
AC blows warm air when the vehicle is idling or moving slowly.
AC performance improves only when driving at higher speeds.
The engine temperature rises while the AC is running.
The fan doesn't turn on when you activate the AC.