Four Seasons 36534 Engine Cooling Fan Switch

Engine Cooling Fan Switch for BMW Applications

Four Seasons Temperature Switch 36534 is an engine-mounted cooling fan switch built for BMW cooling systems that use a 3-terminal, female connector design. It helps control fan operation at the specified temperature points, supporting stable engine cooling in demanding driving conditions.

With a black connector, M14 x 1.50 male thread, and open fan operation, this Four Seasons 36534 temperature switch is a direct-fit style replacement for a wide range of BMW 3 Series, 5 Series, 7 Series, 8 Series, and M models.

Key Features

• Brand: Four Seasons Temperature Switch
• Part number: 36534
• Engine-mounted cooling fan switch design
• Black connector with female terminal connection
• 3-terminal configuration
• M14 x 1.50 fitting thread size
• Fan open/closed: Open
• Temperature on points: 195 / 210
• Meets or exceeds OEM requirements

Product Details

Four Seasons 36534 is a temperature-based engine cooling fan switch used to trigger fan operation when coolant temperature reaches the calibrated range. The switch mounts on the engine and uses a male-threaded fitting with a 3-terminal female connector, making it a practical OE-style replacement for BMW cooling fan control systems. This part cross-references Eastern Catalytic 50233 for the same application.

Compatible With BMW 318i, 318is, 318ti, 325i, 325is, 325iX, 325e, 325es, 525i, 525iT, 530i, 535i, 535is, 540i, 735i, 735iL, 740i, 740iL, 750iL, 840Ci, 850Ci, 850CSi, 850i, M3, M5, and M6 applications listed in the fitment data. The Four Seasons 36534 is also referenced across multiple BMW cooling fan switch applications where engine-mounted temperature control is required.

Common Issues This Part Can Address

• Cooling fan not switching on at the proper temperature
• Fan staying on longer than expected after warm-up
• Erratic engine cooling fan operation
• Overheating caused by a failed temperature switch
• Loss of temperature-based fan control in BMW cooling systems

Installation Notes and Tips

• Verify the connector style, terminal count, and M14 x 1.50 thread before installation.
• Confirm the vehicle uses an engine-mounted coolant fan switch location.
• Inspect the connector and surrounding cooling system components for corrosion or damage before replacing the switch.
• Use the vehicle’s service information to confirm the correct temperature range for the application.

Quality Assurance

Four Seasons 36534 meets or exceeds OEM requirements and is built for direct replacement use in supported BMW cooling fan switch applications. The Four Seasons Temperature Switch line is focused on accurate temperature control for engine cooling systems, helping maintain proper fan engagement in the specified operating range.