Radiator Auxiliary Fan Switch 61311378073 for BMW E36 325i M3 530i 535i Z3

Radiator Auxiliary Fan Switch for BMW

This replacement radiator auxiliary fan switch triggers the cooling fan to prevent engine overheating, cross-referencing part number 61311378073.

Overview

This radiator auxiliary fan switch is engineered to monitor coolant temperature and activate the auxiliary fan. Proper cooling system regulation keeps your engine running within optimal operating temperatures, making this radiator auxiliary fan switch essential for daily drivers and track-day enthusiasts alike. This radiator auxiliary fan switch provides a critical safety margin against overheating in heavy traffic or high-stress driving.

Built For Performance

• Brass housing for corrosion resistance and thermal conductivity.
• Precision bimetal internal contacts for reliable temperature switching thresholds.
• Direct-fit electrical connector pins to match factory wiring harnesses.
• Threaded body with pre-installed sealing washer for leak-free installation.

Fits These Machines

• for BMW E36
• for BMW 325i
• for BMW M3
• for BMW 530i
• for BMW 535i
• for BMW Z3

On-The-Job Use

• Monitoring coolant temperatures during prolonged idling.
• Activating the auxiliary cooling fan during stop-and-go city driving.
• Preventing engine block overheating on hot summer days.

Specs At A Glance

Good To Know

Q: What temperature triggers this switch? A: The switch triggers the fan based on pre-set factory temperature thresholds to match original equipment cooling specs.

Q: Can I install this without draining all the coolant? A: It is highly recommended to drain the coolant level below the switch location to prevent spills and air pockets during installation.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.