Why does the Touareg's electric fan keep running?

[KingRose]

The Touareg's electric fan keeps running and may require replacement of the coolant temperature sensor. The coolant temperature and level sensor consists of a thermostat section and a water level control section, accompanied by a pressure-reducing device before the electric valve and a rotary muffler heater for heating. 1. Principle: The water level sensor inside the container transmits the sensed water level signal to the controller. The computer within the controller compares the actual water level signal with the set signal, calculates the deviation, and then issues "open" or "close" commands to the water supply electric valve based on the nature of the deviation, ensuring the container reaches the set water level. 2. Safety Measures: Only when the set temperature is reached does the controller issue a command to close the valve and cut off the heat source, putting the system into a heat preservation state. During the programming process, it ensures that the electric regulating valve controlling the heat source does not open unless the system reaches a safe water level, thereby avoiding heat loss and preventing accidents.

[StJoseph]

I've been driving the Tiguan for many years, and the electric fan running continuously is no small matter. There are several common causes. The temperature sensor might be faulty, causing the fan to mistakenly think the engine is overheating and keep running; it could also be due to insufficient coolant leading to actual high temperatures, forcing the fan to operate. A short circuit in the wiring or a faulty relay can prevent the fan from stopping. Last time I encountered this, the fan drained half the battery's power before I noticed. Other issues like a malfunctioning control module or unstable voltage can also trigger this condition. It's advisable to check the water temperature gauge immediately after parking. If it's normal, head to a repair shop promptly to diagnose the fault code with a scanner to avoid greater losses, such as engine damage. A quick fix is to check the fuse and connection plugs, but professional repair is safer.

[MaddoxDella]

My Tiguan's electric fan keeps running non-stop, and it was still roaring even after I parked the car. I checked the coolant temperature, which was normal, indicating it wasn't an overheating issue. Later, I found out the fan control unit was faulty, and it became quiet after replacement. Similar problems may stem from sensor failure, aging or corroded wiring, or insufficient battery voltage. I suggest fellow car owners conduct a self-check first: Does the fan stop after turning off the engine? If not, measure whether the battery voltage is normal; if abnormal, consult a professional technician. Delaying repairs may cause the fan to burn out a fuse or drain the battery, making it unable to start—more trouble than it's worth. Spending some time troubleshooting can save you a lot of hassle.

[DiVanessa]

I have some knowledge about automotive technology. The continuous operation of the Tiguan's electric fan is often caused by sensor or switch issues, such as the coolant temperature sensor sending false signals, which forces the fan to start. Sticking relays or control unit program faults can also lead to this phenomenon. Check if the fan motor plug is loose or oxidized, and inspect the wiring for short circuits or exposed wires. Use a simple OBD tool to read fault codes and quickly locate the problem source. If not repaired in time, the fan may burn out or cause circuit overload. It is recommended to test the fan's behavior when the engine is cold to reduce risks.