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Reasons why the Jetta's fan only starts at 110 degrees Celsius

2 Answers

McLaura

07/25/25 4:17am

If the Jetta's fan only starts when the water temperature reaches 110 degrees Celsius, it may be due to the temperature not meeting the requirement for low-speed fan operation or a faulty temperature switch. Below is a brief introduction about Jetta: 1. Company Profile: Jetta is an automobile brand under FAW-Volkswagen Automobile Co., Ltd., a joint venture of the German Volkswagen Group in China. Its first product, the Jetta (Jetta-MK1), was launched in Europe in 1979. 2. Company Development: On December 5, 1991, the first domestically produced Jetta A2 rolled off the assembly line at FAW-Volkswagen's car plant. This model was an upgraded version based on the second-generation German Jetta A2 from 1983. Since then, over nearly 26 years, Jetta has continuously broken new ground in the Chinese market, with cumulative sales exceeding 3.6 million units by 2016. It has earned accolades such as "Road Masterpiece," "Miracle Car," and "China's No.1 Family Car Brand."

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Enid

08/10/25 5:20pm

I've been driving my Jetta for several years, and it was really scary when the fan only kicked in at 110 degrees. The main issue might be a stuck thermostat due to aging—it only opens at higher temperatures to activate the fan. Alternatively, the coolant temperature sensor could be faulty, sending incorrect readings and delaying the fan's startup. Don't underestimate this problem: delayed fan activation can cause engine overheating, accelerate component wear, or even lead to a blown head gasket, increasing fuel consumption and repair costs. On my old car, I tried checking it myself: first, I checked if the coolant level was adequate or if air bubbles were blocking the sensor, then tested the fuses. Don't slack on regular maintenance—inspecting the cooling system every 10,000 kilometers can save a lot of hassle. If you need repairs, go to a reliable shop; Jetta parts are relatively easy to fix. Safety first—a fan not activating on time can be dangerous on long trips, so addressing it early is key.

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