Four Seasons 37491 Engine Coolant Temperature Sensor

Coolant Temperature Sensor for Ram and Dodge Trucks

Four Seasons 37491 is an engine coolant temperature sensor built for direct replacement in select Ram and Dodge Ram heavy-duty trucks. It uses a female oval connector, 2 terminals, and an M16-1.50 fitting thread size for a service-ready OE-style fit.

The Four Seasons Coolant Temp Sensor line focuses on accurate coolant temperature signal input for engine management systems. This sensor meets or exceeds OEM requirements and is a practical replacement for trucks that need dependable temperature feedback for drivability and cooling-system control.

Key Features

• Brand: Four Seasons
• Part number: 37491
• Engine coolant temperature sensor
• Female oval connector
• 2-terminal design
• M16-1.50 fitting thread size
• Meets or exceeds OEM requirements
• Direct-fit style for listed applications

Detailed Product Information

This coolant temp sensor is used in Ram 2500 and Ram 3500 applications across multiple model years, including 2011-2018 Ram 2500 and Ram 3500, plus earlier Dodge Ram 2500 and Dodge Ram 3500 trucks. Four Seasons 37491 is a fitment-focused replacement for owners searching for an engine coolant temperature sensor for Dodge Ram 2500, Dodge Ram 3500, or Ram heavy-duty cooling-system service.

This part cross-references Febi-Bilstein 37491 and Global Parts Distributors LLC 1712596 for the same application.

What This Sensor Helps Address

• Incorrect coolant temperature readings at the engine control system
• Hard starting or rough running related to temperature signal errors
• Cooling fan or gauge behavior tied to a faulty sensor signal
• Check engine light conditions caused by coolant temperature sensor faults
• Intermittent drivability issues on Ram 2500 and Ram 3500 trucks

Installation Notes and Tips

Verify the connector shape, terminal count, and thread size before installation. Confirm the vehicle application against the listed fitment for 2011-2018 Ram 2500 and Ram 3500, 2010 Dodge Ram 2500 and Ram 3500, and the earlier Dodge Ram 2500 and Ram 3500 model years shown. Inspect the connector and sealing surfaces during replacement to help ensure a proper electrical and mechanical connection.

Quality Assurance

Four Seasons states this coolant temperature sensor meets or exceeds OEM requirements. Part number 37491 is built as an OE-style replacement for the listed Ram and Dodge Ram truck applications.