The Metrix 80A 121 405AQ Tank is a direct-fit OEM-style coolant expansion tank engineered for select Audi Q5 applications. It manages thermal expansion, maintains correct system pressure, and serves as the primary coolant fill point — delivering reliable cooling circuit performance from day one.
$57.00
The 80A121405AQ Coolant Tank by World Source is a direct-fit expansion reservoir designed to restore dependable cooling system performance. Specifically, this tank accommodates the natural thermal expansion and contraction of engine coolant under changing operating temperatures. Furthermore, it maintains essential cooling circuit pressure and provides the primary filling and service point for the entire cooling system.
Supplied by World Source to strict original equipment standards, this replacement reservoir installs directly to factory chassis mounting points and quick-connect hose fittings. Additionally, its precision-molded ports ensure seamless integration with the factory coolant level sensor and return lines without modifications.
Inspect your engine compartment for these common failure indicators:
A recurring low-coolant warning light on the instrument cluster despite frequent top-offs.
Visible hairline stress cracks, crazing, or severe yellowing of the translucent plastic housing.
Active coolant weeping or dried crusty residue accumulating around the seam joint or hose necks.
Puddles or drips of coolant collecting beneath the engine bay after parking.
A distinct sweet coolant odor noticeable under the hood or through the climate vents after driving.
Elevated or erratic engine coolant temperature readings caused by air entering the cooling circuit.
OE Part Number: 80A 121 405 AQ
Supplier: World Source
Function: Regulates coolant expansion volume, maintains operating pressure, and provides system fill access.
Material: Virgin high-grade automotive polymer engineered to withstand extreme heat cycles and pressure.
Fitment: Direct OEM-specification replacement matching factory mounting tabs and hose connections.
Testing: Pressure-tested during manufacturing to ensure verified sealing integrity and long-term durability.
Always verify fitment by VIN before ordering. Never remove the reservoir cap or detach coolant hoses while the engine is hot or pressurized, as escaping steam and fluid can cause severe burns.
Always verify fitment by VIN before ordering. Compatibility depends on chassis generation (including select Audi Q5 platforms), engine code, model year, and the original installed reservoir revision.
80A 121 405 AQ
80A121405AQ
| Year | Make | Model | Engine | Notes |
|---|---|---|---|---|
| 2018-2020 | Audi | Q5 | ||
| 2020-2025 | Audi | Q5 PHEV |
The 5N0 122 291C is an OE-style lower radiator coolant hose adapter by VIKA, engineered for the VW Tiguan Mk1 (5N-chassis) with the 2.0L four-cylinder engine. Positioned at the front lower radiator hose junction, this coupling piece connects the lower coolant hose to the radiator outlet port, completing the primary cooling circuit return path. It serves as a cost-effective alternative to the Genuine VW lower adapter. Always confirm fitment by VIN before ordering.
The Service Tech ABS Speed Sensor WHT003858B is a cost-effective, OE-style replacement for select Audi and Volkswagen models. As an updated revision of the WHT003858, it delivers precise wheel-speed data to ABS, ESP, and traction control systems — with plug-and-play installation and no modifications required.
The ATE ABS Speed Sensor WHT003859 is a premium OE-quality replacement for select Audi and Volkswagen models. It delivers precise wheel-speed data to your ABS, ESP, and traction control systems with a true plug-and-play installation.
The Saleri Italo Water Pump 07K121011B is an OE-quality replacement for select Volkswagen engines. It restores reliable coolant circulation, keeps your engine at the correct operating temperature, and installs directly with no modifications required.
The Graf VW Water Pump 026 121 005H is an OE-quality belt-driven replacement for select Volkswagen and Audi 4-cylinder engines. Built for direct installation with no modifications required.
