Four Seasons 36509 Engine Cooling Fan Switch - Upper

Reliable Engine Cooling Fan Switch for BMW and Nissan Vehicles

The Four Seasons Temperature Switch 36509 is designed to maintain optimal engine temperature by controlling the cooling fan operation. Specifically compatible with BMW 328is and Nissan 200SX models, this radiator-mounted temperature switch ensures precise fan activation and deactivation based on engine temperature.

• Connector color: Black with rectangular female connector
• Two terminal pins for secure electrical connection
• Fitting thread size: M16 x 1.50 male thread for radiator mount
• Temperature activation range: turns on at 197°F and off at 188°F
• Meets or exceeds OEM specifications for reliable performance

About the Four Seasons Temperature Switch Product Line

The Four Seasons Temperature Switch line focuses on temperature-sensitive components that regulate engine cooling systems. This product line offers switches engineered to activate cooling fans at precise temperature thresholds, helping maintain engine efficiency and prevent overheating. The 36509 switch is part of this line, providing a radiator-mounted solution with accurate temperature control for select BMW and Nissan vehicles.

Product Details and Specifications

The Four Seasons 36509 engine cooling fan switch features a black rectangular female connector with two terminal pins, ensuring a secure and reliable electrical connection. It mounts directly to the radiator using a male M16 x 1.50 threaded fitting. The switch activates the cooling fan at 197°F and deactivates it at 188°F, maintaining optimal engine temperature. Designed to meet or exceed OEM standards, this temperature switch is engineered for durability and consistent performance in demanding automotive environments.

Common Applications and Issues Addressed

• Prevents engine overheating by activating the cooling fan at the correct temperature
• Ensures cooling fan turns off to avoid unnecessary power consumption
• Replaces faulty or worn temperature switches causing erratic fan operation
• Restores proper radiator fan control in BMW 328is and Nissan 200SX models
• Helps maintain engine efficiency and prolong component life

Installation Notes and Tips

• Ensure the radiator mounting location is clean and free of debris before installation
• Use appropriate tools to avoid damaging the M16 x 1.50 threaded fitting
• Verify connector polarity and secure connection to prevent electrical issues
• Consult vehicle service manual for specific torque specifications and installation procedures

Quality Assurance and Warranty

The Four Seasons Temperature Switch 36509 is manufactured to meet or exceed OEM quality standards, ensuring reliable operation and longevity. This part undergoes rigorous testing to confirm temperature accuracy and durability. While specific warranty details may vary, Four Seasons products typically include a limited warranty against defects in materials and workmanship.