Genuine Audi Q5 Coolant Reservoir Cap

Coolant Overflow Reservoir Cap

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6 Coolant Reservoir Caps found

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Audi Q5 Reservoir Cap Part Number: 3B0-121-321
$23.24 MSRP: $37.18
You Save: $13.94 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cover; Cap, Radiator Cap
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2017 Audi Q5 | Hybrid Prestige, Premium, Premium Plus, Prestige, TDI Premium Plus, TDI Prestige | 4 Cyl 2.0 L FLEX, 4 Cyl 2.0 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L DIESEL, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
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Audi Q5 Reservoir Cap Part Number: 4M0-121-321-Q
$43.55 MSRP: $59.98
You Save: $16.43 (28%)
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Product Specifications
- Other Name: Cap
- Replaces: 4M0-121-321-H, 4M0-121-321-J, 4M0-121-321-K
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2018-2025 Audi Q5 | Premium, Premium Plus, Prestige, Titanium Premium, Titanium Premium Plus, Titanium Prestige | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Q5 Auxiliary Radiator Cap Part Number: 4D0-133-335
$21.49 MSRP: $34.38
You Save: $12.89 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cap; Lower Mount Cap, Radiator Cap, Radiator Coupling
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2021-2025 Audi Q5 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Q5 Reservoir Cap Part Number: 2Q0-121-321-A
$26.86 MSRP: $42.98
You Save: $16.12 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cover; Cap
- Replaces: 3C0-121-321, 2Q0-121-321
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2021-2025 Audi Q5 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Q5 Reservoir Cap Part Number: 4M0-121-321-R
$18.51 MSRP: $29.62
You Save: $11.11 (38%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Cap
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2021-2024 Audi Q5 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
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Audi Q5 Reservoir Cap Part Number: 8R0-121-585
$2.46 MSRP: $3.84
You Save: $1.38 (36%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Grommet
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2012 Audi Q5 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS, 6 Cyl 3.2 L GAS

Audi Q5 Coolant Reservoir Cap

The Audi Q5 Coolant Reservoir Cap is a heat-resistant cap that provides a tight seal to ensure that coolant does not escape and become contaminated with airborne debris or dirt. This helps your engine avoid overheating and damage from corrosion. The Coolant Reservoir Cap is made of strong plastic that can handle temperature and chemical changes while delivering the renowned Audi build quality. It clicks onto the factory reservoir in an instant, restoring the closed loop flow that transports fluid to and from the radiator and overflow tank. By blocking oxygen from getting in, it stops rust from forming inside metal passages and prevents ethylene glycol from spilling onto roads, which is good for the environment and appreciated by drivers. The compatibility is exactly with the reservoir that is being locked to the compact SUV platform as per the official text. Thus, owners of the specified generation of the Q5 can fit the cap without any modifications or special tools, giving you a perfect fit in any Q5, whether stock or modified. Upon installation, cooling performance improves because the system pressure is constant. The ability to keep constant system pressure allows the thermostats and sensors to perform at their designed thresholds during steady highway pulls and slow-moving city crawls. The sealed nature of the coolant avoids sudden spikes in temperature that can otherwise damage the head gaskets and cause warping of the blocks. An important feature is the calibrated spring valve located inside the Coolant Reservoir Cap, which helps manage expansion and contraction, thus reducing hose cracking when under a heavy load. Another benefit is its easy-to-grip knurled edge, which allows for a firm hand grip even with wet gloves when checking under the hood. By opting for this original part from Audi, you are opting for reliability, durability, and consistent performance, all of which underline the reason why Audi enthusiasts prefer parts compatible with the standards to which Audi itself is subjected. The Coolant Reservoir Cap is a small but vital part that protects your engine against overheating.

Choose original equipment manufacturer Coolant Reservoir Cap for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Coolant Reservoir Cap at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi Q5 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your Q5 needs now.