Standard Motor Products TS444 Coolant Fan Switch Temperature Sender

The Standard Motor Products TS444 is a direct-fit replacement coolant fan switch (also known as a temperature sender or radiator fan switch) engineered to restore proper cooling fan operation in your vehicle's engine cooling system. When coolant reaches a specified temperature threshold, this switch triggers the electric cooling fan to draw air through the radiator and regulate engine temperature.

Key Features:

• Factory-calibrated to activate at the specified coolant temperature set point for precise fan engagement
• Utilizes a bimetallic contact design — two metals fused together expand at different rates, triggering a snap-action electrical contact that sends the signal to the fan controller
• Custom wax pellet construction expands when heated to actuate the snap-action electrical contact with repeatable accuracy
• All units are calibrated and tested at the factory to confirm switch actuation at the correct temperature
• Built to meet or exceed OEM specifications for proper fit, form, and function
• High-grade materials engineered to withstand the demanding thermal and electrical environment of the cooling system

The Standard Motor Products TS444 coolant fan switch is a reliable, OE-quality replacement for vehicles requiring a radiator fan temperature switch or thermal fan switch. It installs directly in place of the original unit for a straightforward, no-modification repair.