Nissens 996145 Engine Coolant Reservoir

Engine Coolant Reservoir for Audi RS7 and A6

This Nissens engine coolant reservoir is built for select Audi applications that require a pressurized plastic expansion tank with integrated level monitoring. It is a direct-fit cooling system component for 2012-2015 Audi A6 and 2014-2018 Audi RS7 applications, with part number 996145.

Key Features

• Plastic construction for cooling system use
• Pressurized design
• Cap included with high quality plastic cap type
• Level sensor included
• Mounting bracket included
• 1.64L capacity
• Nissens part number 996145

Product Details

Nissens develops thermal management components with a focus on OE-style fit and consistent manufacturing quality. This coolant reservoir is designed to hold engine coolant, maintain system pressure, and provide a mounting point for the level sensor and cap assembly. For Audi A6 and Audi RS7 cooling system service, 996145 supports proper coolant expansion and reservoir function in the engine bay.

This part cross-references Audi OE number 4G0121403AC for the same application.

Common Cooling System Issues It Can Address

• Cracked or leaking coolant reservoir housing
• Low coolant warnings caused by a faulty level sensor tank
• Pressure loss from a damaged expansion tank
• Cap-related coolant seepage or venting issues
• Replacement needs after age-related plastic deterioration

Installation Notes

Verify the reservoir shape, sensor connection, cap style, and mounting points against the original unit before installation. Transfer or connect all cooling system lines carefully, then refill and bleed the system according to Audi service procedures to remove trapped air. Confirm there are no leaks and that the coolant level sensor operates correctly after installation.

Quality Assurance

Nissens is known for manufacturing thermal and engine efficiency components for the aftermarket, with products developed to consistent quality standards across its range. Part number 996145 is built as a cooling system replacement for Audi A6 and Audi RS7 applications.