Thermostat Switch Sensor 3408643 3915945 for Engine 4B3.9 6B5.9 B4.5 B6.7S 4.5

Thermostat Switch Sensor

The Thermostat Switch Sensor (OEM cross-reference 3408643, 3915945) monitors engine coolant temperature and activates cooling fan or warning systems for engines 4B3.9, 6B5.9, B4.5, B6.7S, and 4.5.

Overview

The Thermostat Switch Sensor 3408643 3915945 is a temperature-activated switch that controls engine cooling components. Designed for engines like 4B3.9 and 6B5.9, this sensor ensures optimal operating temperature by engaging fans or triggering alarms. It is a direct replacement for faulty switches in various diesel and industrial engines.

Built For Performance

• Precision temperature calibration for accurate switching
• Rugged housing resists engine compartment conditions
• Direct replacement for OEM part numbers 3408643 and 3915945
• Threaded fitting for easy installation
• Reliable electrical contacts for consistent performance

Fits These Machines

• for Engine 4B3.9
• for Engine 6B5.9
• for Engine B4.5
• for Engine B6.7S
• for Engine 4.5

On-The-Job Use

• Monitors coolant temperature in diesel engines
• Activates electric cooling fans when preset temperature is reached
• Used in agricultural, construction, and industrial equipment
• Common replacement part during engine overhaul

Specs At A Glance

Good To Know

Q: What temperature does this switch trigger at? A: The switch activates at a preset temperature specific to the engine model, typically around 180-200°F; check your service manual for exact specifications.

Q: Is this sensor compatible with aftermarket cooling systems? A: Yes, it is designed as a direct replacement for OEM sensors and works with most factory and aftermarket cooling fan controllers.

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