Four Seasons 37863 Engine Coolant Temperature Sensor

BMW Coolant Temp Sensor Replacement

Four Seasons 37863 is an engine coolant temperature sensor for BMW cooling systems that use a female, 2-terminal rectangular connector and a clip-in, no-thread mounting style. It meets or exceeds OEM requirements and is built for direct replacement in radiator and radiator hose applications across a wide range of BMW models.

Key Features

• Engine coolant temperature sensor for BMW cooling system service
• Female rectangular connector with 2 terminals
• No threads, clip-in fitting style
• Meets or exceeds OEM specifications
• Direct-fit replacement for radiator and radiator hose locations
• Four Seasons part number 37863

Product Details

The Four Seasons Coolant Temp Sensor line focuses on accurate coolant temperature signal input for engine management and gauge operation. Part number 37863 is a direct replacement sensor for many BMW 3 Series, 5 Series, 6 Series, 7 Series, X3, X5, X6, Z4, and M models, including applications such as the 2007-2013 BMW 328i, 2006-2016 BMW 550i, and 2007-2017 BMW X5. This part cross-references URO 13621433077 for the same application.

What It Helps Fix

• Incorrect coolant temperature readings on the dash or scan tool
• Engine management faults related to coolant temperature input
• Cooling fan operation issues triggered by bad temperature data
• Hard starting, rough running, or drivability concerns tied to sensor signal errors
• Check engine lights caused by coolant temperature sensor failure

Installation Notes and Tips

Verify the connector style, terminal count, and mounting location before installation. This sensor uses a clip-in design with no threads, so the radiator or hose port must match the OE-style retention method. Confirm the vehicle application by year, make, model, and sensor location, especially on BMW 650i, BMW M6, and BMW X5 platforms where radiator and radiator hose placements vary by configuration.

Quality Assurance

Four Seasons identifies this coolant temp sensor as meeting or exceeding OEM requirements for fit and function. Use the part number 37863 and the vehicle-specific fitment details to confirm the correct replacement before service.