Four Seasons 36539 Engine Cooling Fan Switch - Right

Temperature Switch for Engine Cooling Control

The Four Seasons Temperature Switch 36539 is an engine-mounted cooling fan switch built for temperature-based fan operation. It uses a white round female connector with 2 terminals and an M16-1.50 male thread for direct engine mounting. This switch opens at 185 degrees and closes at 194 degrees to help control fan engagement on the cooling system.

Compatible with 1989-1994 Hyundai Sonata, right side engine-mounted coolant fan switch applications, Four Seasons 36539 is an OE-style replacement that meets or exceeds OEM requirements. It is also cross-referenced to Marmon Ride Control A6610 for the same application.

Key Features

• Brand: Four Seasons Temperature Switch
• Part number: 36539
• Engine-mounted cooling fan switch
• White round female connector
• 2-terminal electrical connection
• M16-1.50 male thread fitting
• Fan open/closed operation
• Temperature off at 185 degrees
• Temperature on at 194 degrees
• Meets or exceeds OEM specifications

Detailed Description

Four Seasons 36539 is a temperature switch for engine cooling fan control, built for vehicles that use an engine-mounted coolant fan switch. The switch is designed to respond to coolant temperature changes and trigger fan operation at the specified on and off points. For buyers searching for a Hyundai Sonata cooling fan switch, engine mounted temperature switch, or Four Seasons 36539 replacement, this part matches the listed fitment and connection style.

Fits 1989-1994 Hyundai Sonata, right. This application is listed as an engine mounted coolant fan switch, making it a direct match for temperature-controlled cooling fan systems on the Hyundai Sonata. Four Seasons 36539 is also a useful search term for parts lookup when replacing a worn or inaccurate fan temperature switch.

What It Helps Address

• Cooling fan not switching on at the correct temperature
• Cooling fan staying on longer than expected
• Inconsistent engine temperature control
• Faulty temperature signal to the fan circuit
• Replacement needs for a worn engine-mounted coolant fan switch

Installation Notes and Tips

Verify the connector shape, terminal count, thread size, and temperature range before installation. This switch uses a round white female connector and an M16-1.50 male fitting, so matching the original electrical and threaded connection is important for proper fitment. Confirm the vehicle application against the listed 1989-1994 Hyundai Sonata, right-side engine-mounted configuration before replacement.

Quality Assurance

Four Seasons 36539 meets or exceeds OEM requirements for the listed application. The Four Seasons Temperature Switch line focuses on temperature-based engine cooling control components, and this part is built to match the specified operating range and connection style for accurate replacement service.