2025 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

VALVOLINE supplies the 3 Coolant / Antifreeze parts for the 2025 Audi A6.

In the Economy grade, VALVOLINE supplies 1 part: the catalog's value-priced group. A representative part number is VALVOLINE 719009.

The Standard Replacement section lists 1 option from VALVOLINE — built to original-equipment specification. VALVOLINE 904683 is listed in this group.

1 ungrouped part is not assigned to a grade, with the same engine-level match.

This group includes VALVOLINE 719009 and VALVOLINE 904683 and the remaining parts above.

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

One part is listed for the 2025 Audi A6 — REIN CHP0663.

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 2025 Audi A6 come from MOTORAD.

Part numbers include MOTORAD T111 and MOTORAD T143.

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

5 Intercooler parts are listed for the 2025 Audi A6, from NISSENS, GPD, HELLA and 1 other brand.

This group includes GPD 2711413, HELLA 366340871 and NISSENS 961466 and the remaining parts 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

4 Radiator parts are listed for the 2025 Audi A6, from NISSENS, CSF and SPECTRA PREMIUM.

Part numbers include CSF 4002, NISSENS 606573 and NISSENS 606578, among others listed above.

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

One part is listed for the 2025 Audi A6 — SKP SK621318.

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 2025 Audi A6, from STANDARD MOTOR PRODUCTS, NISSENS, HOLSTEIN and 2 other brands. STANDARD MOTOR PRODUCTS TX275 carries the "Popular" badge.

Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CTS0163.

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

2 ungrouped parts are not assigned to a grade, with the same engine-level match.

Part numbers include STANDARD MOTOR PRODUCTS TX275, HOLSTEIN 2CTS0163 and NISSENS 207067, among others listed 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

This group shows a single part: MOTORAD 1229221.

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

One part is listed for the 2025 Audi A6 — MAHLE / CLEVITE 72622.

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

This group shows a single part: MOTORAD CH3116.

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

16 Water Pump parts for the 2025 Audi A6 come from 10 brands — FOUR SEASONS, NISSENS, BECK/ARNLEY and 7 other brands. The "Popular" part is BECK/ARNLEY 1312517.

The Economy section: 4 options from BECK/ARNLEY, US MOTOR WORKS and FVP. BECK/ARNLEY 1312517 is listed in this group.

Standard Replacement: 11 parts, from FOUR SEASONS, NISSENS, GATES and 3 other brands. A representative part number is GATES 41568E.

1 further part sits outside the graded sections, with the same engine-level match.