Motorad T109 Engine Coolant Reservoir Cap - Left

Engine Coolant Reservoir Cap for Hyundai and Kia

The Motorad Standard T109 engine coolant reservoir cap is a threaded, pressurized replacement cap built for cooling systems that require a 16 PSI rating. It is made from black plastic and uses a coolant recovery system design to help maintain proper system pressure and vacuum control.

Compatible with select Hyundai Elantra, Hyundai Tucson, Kia Sportage, and other Hyundai/Kia applications, this cap is designed for direct replacement service where the original reservoir cap has worn, cracked, or no longer seals correctly. The Motorad T109 is built to OEM specifications for fit and function.

Key Features

• Engine coolant reservoir cap with 16 PSI pressure rating
• Threaded attachment for secure installation
• Black plastic construction
• Pressurized design with coolant recovery system
• Standard Motorad line replacement part
• Diameter and width: 1.78 in
• Cross-reference: Carlson 7109

Product Details

The Motorad Standard line focuses on direct-fit cooling system service parts built to meet OEM specifications. Part number T109 is engineered with proper relief and vacuum valves to help the reservoir cap maintain the pressure balance required by the cooling system. This matters on vehicles such as the Hyundai Elantra, Hyundai Kona, and Kia Niro, where stable coolant system pressure supports normal engine temperature control.

This part cross-references Carlson 7109 for the same application. It also aligns with OE-style replacement needs for Hyundai and Kia models across the 2016-2026 model years, including Hyundai Elantra, Hyundai Ioniq 5, Hyundai Tucson, Kia Sportage, and Kia Soul applications.

Common Problems This Cap Can Address

• Coolant loss from a cap that no longer seals properly
• Pressure-related cooling system leaks at the reservoir neck
• Vacuum valve issues that affect coolant recovery
• Cracked, worn, or damaged reservoir cap threads
• Incorrect pressure retention in the expansion tank

Installation Notes and Tips

Verify the reservoir neck style, threaded attachment, and 16 PSI pressure requirement before installation. Confirm the application against the vehicle listing for your Hyundai Elantra, Hyundai Tucson, Kia Sportage, or other listed model, and inspect the reservoir sealing surface for damage before installing the new cap. A proper seal is important for maintaining cooling system pressure.

Quality Assurance

Motorad manufactures this cap to meet OEM specifications and quality tests it for use in demanding automotive cooling systems. The design uses high-quality components with proper relief and vacuum valve operation to support reliable cooling system service.