Wells 5S16389 HVAC Sun Load Sensor

The Wells 5S16389 HVAC Sun Sensor is a direct-fit replacement sun load sensor designed to restore proper automatic climate control operation. Also known as a sunload sensor or solar radiation sensor, this component monitors the intensity of sunlight entering the vehicle cabin and provides that data to the HVAC control module, allowing the system to automatically adjust blower speed and temperature output for optimal passenger comfort.

Sunlight entering a vehicle can account for a significant portion of interior heat load, making the sun sensor a critical input for automatic temperature control (EATC) systems. The sensor uses a photodiode that reacts to changes in solar intensity — as sunlight increases, the sensor's resistance increases and the output signal voltage decreases, prompting the climate control system to compensate by adjusting airflow distribution and fan speed. A failed or inaccurate sun sensor can cause the HVAC system to default to a fixed value, resulting in inconsistent cabin temperatures.

Key Features:

• Direct-fit replacement for the original sun load sensor
• Photodiode-based design accurately measures solar radiation intensity
• Signals the HVAC control module to adjust blower speed and blend door operation
• Supports automatic and electronic automatic temperature control (EATC) systems
• Manufactured by Wells Vehicle Electronics to OE fit, form, and function standards
• Restores accurate sun load input to prevent erratic or default-mode climate control behavior

Wells Vehicle Electronics has been a trusted supplier of vehicle sensors, switches, and engine management components for over a century. The 5S16389 is engineered to meet original equipment specifications, ensuring a reliable, long-lasting repair.