Why does the Tiguan's fan keep running continuously at 96°C water temperature?
3 Answers
This situation is generally caused by a stuck thermostat switch, and it is recommended to replace the water temperature sensor. Below is the relevant information: Water Temperature Sensor: The function of the water temperature sensor is to convert the coolant temperature into an electrical signal. After inputting it into the ECU, it performs the following actions: adjusts the fuel injection volume—increasing fuel injection during low temperatures; adjusts the ignition timing—advancing ignition timing during low temperatures and retarding it during high temperatures to prevent knocking; and affects the idle control valve—during low temperatures, the ECU controls the idle control valve based on the water temperature sensor signal to increase idle speed. Tiguan: The Tiptronic 6-speed automatic transmission, derived from Porsche sports car technology, perfectly complements the TSI engine, elevating the Tiguan's powertrain to industry-leading levels and delivering an unparalleled driving experience. Additionally, the Trendline, Comfortline, and Highline versions of the Tiguan feature the advanced 4MOTION intelligent all-wheel-drive system, which enables intelligent distribution of drive torque to all four wheels, ensuring optimal traction on slippery or muddy terrain and providing owners with exhilarating off-road performance.
Recently, my own Tiguan has been showing a coolant temperature of 96°C with the fan constantly buzzing nonstop, which is really annoying. I remember the normal operating temperature should be around 90°C when the fan cycles on and off. But if it keeps running continuously, there might be an issue with the cooling system. For instance, last time I noticed the coolant level was slightly low, and topping it up helped. It could also be a stuck thermostat that won't open, making the fan think the engine is still overheating. A continuously running fan isn't just noisy—it can drain the battery faster and may lead to engine overheating, which could result in costly major repairs. I suggest you don't delay; take it to a repair shop and have the mechanic check the voltage, wiring, and sensors. Addressing minor issues early saves trouble. Safe driving comes first—never underestimate coolant temperature issues.
After doing repair work for a long time, I've seen that it's quite common for the Tiguan's water temperature to stay at 96°C with the fan running non-stop. You should check if the coolant level is sufficient and whether there's any leakage. Also, inspect if the thermostat is opening and closing properly or if the temperature control switch has failed. The fan is controlled by sensors, and if they're faulty, it'll just keep spinning. Sometimes, a stuck relay or a short circuit in the wiring can also cause trouble. You can try testing the voltage yourself, but if that doesn't work, take it to a professional shop. Fix it in time before the water temperature skyrockets and the engine gives out, so you don't end up spending big money on replacing parts.
