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This sensor mounts to the lower radiator hose, and is very common place for leaks to appear, especially if it's been re-installed into a new hose. The fan switch controls the operation of the electric auxiliary fan, depending on the temperature of the coolant. This high-quality replacement comes complete with a new o-ring.
Coolant leaks that appear to be coming from a failing lower radiator hose are often due to this little sensor. Read about the installation of this fan switch on our very own E46 by clicking here.
Please note: Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice