Motorad T93 Engine Coolant Reservoir Cap - Auxiliary

Engine Coolant Reservoir Cap for VW and Audi

The Motorad Standard T93 engine coolant reservoir cap is a threaded, pressurized replacement cap built for closed coolant recovery systems. It is designed to meet OEM specifications and uses proper relief and vacuum valves to help maintain stable cooling-system pressure on supported Volkswagen and Audi applications.

With a black plastic body, red indicator markings, and a pre-installed gasket or seal, the T93 is made for straightforward service on vehicles such as the Volkswagen Tiguan, Jetta, Atlas, and Audi A3. This Motorad T93 cap is a direct-fit style replacement for many late-model VW and Audi cooling systems.

Key Features

• Engine coolant reservoir cap for pressurized, closed coolant recovery systems
• Threaded attachment type for secure installation
• Plastic construction with black finish
• Maximum pressure rating: 23.0
• Vented design with relief and vacuum valves
• Indicator markings in red for visual identification
• Pre-installed gasket or seal
• Round shape with 3.15 in. diameter and 1.22 in. overall height

Product Details

Motorad Standard T93 is engineered as an OE-style coolant reservoir cap for vehicles that require a 1.46 in. filler neck inside diameter and threaded cap engagement. The cap is built from high-quality plastic and tested for use in demanding automotive cooling systems. Its vented, pressurized design helps maintain the correct system pressure while the vacuum valve supports normal coolant recovery as the engine cools. This part cross-references Rein CPE0039 for the same application.

Fits 2013-2026 Volkswagen Tiguan, N/A; fits 2017-2026 Volkswagen Jetta, N/A; fits 2018-2026 Volkswagen Atlas, N/A; fits 2020-2026 Volkswagen Atlas Cross Sport, N/A; fits 2021-2025 Volkswagen ID.4, N/A; fits 2018-2025 Volkswagen GTI, N/A; fits 2018-2025 Audi Q3, N/A; fits 2022-2025 Audi A3, N/A; fits 2022-2025 Audi A3 Quattro, N/A; fits 2022-2025 Audi RS3, N/A; fits 2022-2025 Audi S3, N/A.

What It Helps Address

• Coolant loss caused by a worn or damaged reservoir cap seal
• Pressure irregularities in a closed coolant recovery system
• Vacuum valve issues that affect coolant return during cooldown
• Cracked, faded, or hard-to-read original cap markings
• Service problems from a cap that no longer threads on securely

Installation Notes and Tips

Confirm the filler neck inside diameter, thread diameter, and pressure rating before installation. Inspect the reservoir neck and sealing surface for damage, then install the cap by threading it on until fully seated. Verify that the cap matches the vehicle’s standard or auxiliary coolant reservoir application before service. Motorad T93 is also a fitment match for many Volkswagen and Audi models, including the Volkswagen Passat, Arteon, Golf R, and Audi Q4 e-tron.

Quality Assurance

Motorad manufactures this Standard line cap to meet OEM specifications and quality-test it for use in demanding cooling-system conditions. The design includes proper relief and vacuum valves, along with a pre-installed seal, to support consistent operation in the intended application.