2021 Audi A6 Cooling System Parts

This table covers the engine coolants and antifreeze formulations specified for this cooling system. Typical signs include a rising temperature gauge, rusty or sludged coolant, or a heater that blows cold. Use the chemistry named in the notes. Mixing silicate, OAT and HOAT formulas can gel in the radiator. Read more

16 Coolant / Antifreeze parts are listed for the 2021 Audi A6, from PRESTONE, PEAK, PENTOSIN and 3 other brands. FVP MV5050GAL carries the "Popular" badge. 14 parts fit every engine; the other 2 are engine-specific.

The Compatible With All Colors section lists 1 option from PRESTONE — grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. PRESTONE AF3055 is listed in this group.

In the Economy grade, FVP, PRESTONE, VALVOLINE and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 6 options from PENTOSIN, AISIN, PEAK and 1 other brand — built to original-equipment specification. AISIN ACE010 is listed in this group.

This table covers the hard pipes and extra hoses in the coolant circuit. Read more

One part is listed for the 2021 Audi A6 — REIN CHP0663.

This table covers the seals at the Coolant Hose / Pipe. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Coolant Hose / Pipe Seal parts for the 2021 Audi A6 come from 2 brands — FEL-PRO and MAHLE / CLEVITE.

Part numbers include FEL-PRO 36130 and MAHLE / CLEVITE C32354.

This table covers the Coolant Hose Connector flanges. Read more

One part is listed for the 2021 Audi A6 — VAICO V105890.

This table covers the Coolant Hose Flange plugs. Typical signs include a leak at the drain or glow-plug hole, or a plug that has rounded off. Replace the crush washer and torque to the spec in the notes. Read more

One part is listed for the 2021 Audi A6 — ÜRO PARTS 357121140.

This table covers the caps on the overflow / expansion tank. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable. Read more

2 Coolant Reservoir Cap parts for the 2021 Audi A6 come from 2 brands — MOTORAD and ÜRO PARTS. Every part fits both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged.

This group includes MOTORAD T111 and ÜRO PARTS 4M0121321Q.

This table covers the intercoolers that cool turbo or supercharger charge air. Read more

5 Intercooler parts are listed for the 2021 Audi A6, from NISSENS, HELLA, TECHPRO and 1 other brand.

Part numbers include HELLA 366340871, NISSENS 961466 and NISSENS 961345, among others listed above.

This table covers the radiators that dump engine heat to airflow through the core. Typical signs include overheating in traffic, a wet core, or coolant that disappears with no puddle. Replace the cap if it cannot hold the rated pressure, and bleed the system after the swap. Read more

12 Radiator parts are listed for the 2021 Audi A6, from GPD, NISSENS, TYC and 4 other brands. NISSENS 606578 carries the "Popular" badge. 1 part fits every engine; the other 11 are engine-specific.

Economy: 3 parts, from GPD and VEMO. A representative part number is GPD 13665.

The Standard Replacement section: 9 options from NISSENS, TYC, UAC and 2 other brands. NISSENS 606578 is listed in this group.

This table covers the fan assemblies (and clutches, where listed) that pull air through the radiator. Read more

5 Radiator Fan Assembly parts for the 2021 Audi A6 come from 3 brands — VEMO, GPD and UAC. The "Popular" part is UAC FA50946C. Every part fits both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged.

The Economy section: 4 options from VEMO and GPD. GPD 2812266 is listed in this group.

Standard Replacement: 1 part, from UAC. A representative part number is UAC FA50946C.

This group includes UAC FA50946C, GPD 2812266 and VEMO V15011943 and the remaining parts above.

This table covers the shrouds that duct air through the fan and radiator. Read more

One part is listed for the 2021 Audi A6 — SKP SK621318.

This table covers the Radiator insulators. Read more

2 Radiator Insulator parts for the 2021 Audi A6 come from VNE. Every part fits both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged.

Part numbers include VNE 41000073 and VNE 41000074.

This table covers the Radiator Insulator sleeves. Read more

This group shows a single part: REIN AVM0730.

This table covers the Radiator mounts. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes. Read more

This group shows a single part: REIN AVM0729.

This table covers the senders that report coolant temperature to the gauge or ECU. Typical signs include a gauge that sits on empty or overheat, or a lamp that does not match what the engine is doing. Rule out the cluster and the wiring before replacing the sender. Read more

7 Temperature Sender / Sensor parts are listed for the 2021 Audi A6, from GPD, HOLSTEIN, STANDARD MOTOR PRODUCTS and 3 other brands. STANDARD MOTOR PRODUCTS TX275 carries the "Popular" badge. 3 parts fit every engine; the other 4 are engine-specific.

Economy: 3 parts, from GPD and HOLSTEIN. A representative part number is GPD 1712644.

The Standard Replacement section: 4 options from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, VNE and 1 other brand. STANDARD MOTOR PRODUCTS TX275 is listed in this group.

Listed part numbers: STANDARD MOTOR PRODUCTS TX275, GPD 1712644 and GPD 1814521, plus the other parts above.

This table covers the thermostats that open the coolant circuit at the specified temperature. Typical signs include slow warm-up, a gauge that climbs in traffic, or heat that never quite arrives. Replace the housing gasket with the thermostat and bleed the system so a trapped air pocket does not cook the new part. Read more

7 Thermostat parts for the 2021 Audi A6 come from 6 brands — MOTORAD, VEMO, BECK/ARNLEY and 3 other brands. The "Popular" part is MOTORAD 838235.

The Economy section: 1 option from VEMO. VEMO V15992133 is listed in this group.

Standard Replacement: 3 parts, from MOTORAD, BECK/ARNLEY and INA. A representative part number is MOTORAD 838235.

3 further parts sit outside the graded sections, with the same engine-level match.

Part numbers include MOTORAD 838235, VEMO V15992133 and BECK/ARNLEY 1430913, among others listed above.

This table covers the seals at the thermostat housing and water outlet. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again. Read more

2 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 Audi A6, from ELRING and MAHLE / CLEVITE.

Part numbers include ELRING 453710 and MAHLE / CLEVITE 72622.

This table covers the housings and outlets the thermostat sits in. Read more

3 Thermostat Housing / Water Outlet parts for the 2021 Audi A6 come from 3 brands — GATES, MOTORAD and VEMO.

Part numbers include GATES CO34954, MOTORAD CH3116 and VEMO V10990020.

This table covers the pumps that circulate coolant through the block and radiator. Typical signs include coolant at the weep hole, pulley play, or a growl from the front of the engine. Replace the thermostat and refill with the specified coolant whenever the pump comes off. Read more

29 Water Pump parts for the 2021 Audi A6 come from 12 brands — PIERBURG, GATES, FOUR SEASONS and 9 other brands. The "Popular" part is BECK/ARNLEY 1312517. Grades run from Economy through Standard Replacement; Standard Replacement is the most populated section, led by PIERBURG, GATES, FOUR SEASONS and 3 other brands.