1. Faulty relay: The condenser fan relay is responsible for turning the fan on and off. A faulty relay can cause the fan to stay on even when the car is off.
2. Stuck thermal switch: The thermal switch is a temperature-sensitive switch that turns on the condenser fan when the coolant temperature reaches a certain level. A stuck thermal switch can cause the fan to stay on even when the coolant temperature is low.
3. Wiring issue: A short in the wiring harness can bypass the relay and send power to the condenser fan.
4. ECM failure: The ECM controls all of the electrical components in the car. A faulty ECM can cause the condenser fan relay to stick in the "on" position.
To troubleshoot this issue, you will need to check the following:
1. Check the condenser fan relay. If the relay is faulty, it will need to be replaced.
2. Check the thermal switch. If the thermal switch is stuck, it will need to be replaced.
3. Check the wiring harness for any shorts or damage. If any damage is found, the wiring harness will need to be repaired.
4. Have the ECM scanned for any fault codes. If any fault codes are found, they will need to be diagnosed and corrected.
If you are unable to diagnose and fix the problem yourself, you will need to take your car to a qualified mechanic.
