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At what temperature does the Passat B5 fan operate?

2 Answers

ZoeyLee

07/23/25 8:02pm

It operates around 90 degrees and starts at 95 degrees. Working principle of Passat electronic fan: The car's electric fan is controlled by a thermostat. When the water temperature rises to the upper limit, the thermostat turns on the power, and the fan starts working. When the water temperature drops to the lower limit, the thermostat turns off the power, and the fan stops working. Methods to determine if the electric fan is good or bad: Check the color of the coil at the fan motor's ventilation port for any signs of burning. If there are burn marks, it means the fan motor coil can no longer be used. Turn the shaft by hand to observe its operation. If it operates with difficulty or is not smooth, it indicates that the internal bearings are lacking oil or the rotor is scraping. If scraping occurs, in addition to adding oil and cleaning, the bearings on both sides must be replaced to eliminate the scraping phenomenon.

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Clarence

08/10/25 6:03pm

My old Passat B5 has been running for over a decade. The cooling fan usually kicks in when the engine temperature rises slightly above 90°C, specifically around 93-95°C. During normal driving, the coolant temperature gauge stays in the normal 90°C zone, and the fan doesn't run constantly. However, in traffic jams or hot weather when the temperature climbs to 95°C, the fan activates to assist with cooling. One summer during a highway traffic jam, I got quite alarmed when I saw the temperature approaching 100°C before the fan started spinning rapidly. A friendly reminder: if the fan is delayed or fails to start, it might be due to aged relays or insufficient coolant. Regular checks for dust accumulation on the radiator are essential - cleaning it can improve cooling efficiency and prevent premature fan wear. During every maintenance service, I always ask the mechanic to test the fan's response. This car is truly durable, and its fan system has proven quite reliable.

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