2018 Audi A3 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 for the 2018 Audi A3 come from 6 brands — PRESTONE, PEAK, PENTOSIN and 3 other brands. The "Popular" part is FVP MV5050GAL. 11 parts fit every engine; the other 5 are engine-specific.

In the Compatible With All Colors grade, PRESTONE supplies 1 part: grouped under the catalog's "Compatible With All Colors" designation — the notes column spells out what sets them apart. A representative part number is PRESTONE AF3055.

The Economy section lists 4 options from FVP, PRESTONE, VALVOLINE and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

In the Premium grade, PRESTONE and PEAK supply 5 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, PENTOSIN, AISIN, PEAK and 1 other brand supply 6 parts: built to original-equipment specification. A representative part number is AISIN ACE010.

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

7 Coolant Hose / Pipe parts for the 2018 Audi A3 come from 4 brands — REIN, VAICO, ÜRO PARTS and 1 other brand. The "Popular" part is REIN CHP0663.

This group includes REIN CHP0663, ÜRO PARTS 06L121131PRM and REIN CHE1012 and the remaining parts above.

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

5 Coolant Hose / Pipe Seal parts are listed for the 2018 Audi A3, from AJUSA, DORMAN, ELRING and 2 other brands.

Part numbers include AJUSA 16098500, DORMAN 47451 and ELRING 703570, among others listed above.

This table covers the Coolant Hose Connector flanges. Read more

22 Coolant Hose Connector / Flange parts for the 2018 Audi A3 come from 6 brands — VAICO, MOTORAD, DORMAN and 3 other brands. The "Popular" part is DORMAN 627002. 3 parts fit every engine; the other 19 are engine-specific.

The Economy section: 5 options from DORMAN, SKP and VAICO. DORMAN 627002 is listed in this group.

Standard Replacement: 17 parts, from VAICO, MOTORAD, REIN and 1 other brand. A representative part number is REIN CHC0730.

This table covers the seals at the Coolant Hose Connector / Flange. 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 2018 Audi A3 — ELRING 332740.

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

This group shows a single part: ÜRO PARTS 357121140.

This table covers the Coolant Hose retainers and clips. Read more

This group shows a single part: BECK/ARNLEY 1470039.

This table covers the Coolant Pipe adapters. Read more

One part is listed for the 2018 Audi A3 — ÜRO PARTS 06K121143PRM.

This table covers the overflow / expansion tanks that hold extra coolant. Read more

7 Coolant Reservoir parts are listed for the 2018 Audi A3, from TECHPRO, REIN, ÜRO PARTS and 3 other brands. REIN EPT0142 carries the "Popular" badge.

Listed part numbers: REIN EPT0142, ÜRO PARTS 5Q0121407T and HELLA 366365551, plus the other parts above.

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

4 Coolant Reservoir Cap parts are listed for the 2018 Audi A3, from CALORSTAT, GATES, MOTORAD and 1 other brand.

Listed part numbers: CALORSTAT RC0162, GATES 31529 and MOTORAD T93, plus the other parts above.

This table covers the adapters used to pressure-test this cooling system. Read more

2 Cooling System Tester Adapter parts for the 2018 Audi A3 come from GATES.

This group includes GATES 31433 and GATES 31434.

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

11 Intercooler parts for the 2018 Audi A3 come from 9 brands — NISSENS, GPD, SPECTRA PREMIUM and 6 other brands. The "Popular" part is NISSENS 96494.

This table covers the Intercooler Air Hose pipes. Read more

6 Intercooler Air Hose / Pipe parts for the 2018 Audi A3 come from 2 brands — GATES and VAICO. The "Popular" part is GATES 26475.

Part numbers include GATES 26475, GATES 26491 and GATES 26474, among others listed above.

This table covers the Intercooler 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

REIN supplies both parts for the 2018 Audi A3.

Part numbers include REIN AVM0728 and REIN AVM0696.

This table covers the Inverter coolers. Typical signs include overheated fluid, a leak at the fittings, or mixed fluids in the reservoir. Flush the lines when you replace a cooler. Read more

One part is listed for the 2018 Audi A3 — KOYORAD A14021.

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

21 Radiator parts for the 2018 Audi A3 come from 8 brands — NISSENS, MAHLE / CLEVITE, CSF and 5 other brands. The "Popular" part is CSF 3974.

The Economy section: 1 option from TECHPRO. TECHPRO AU3010156 is listed in this group.

Standard Replacement: 8 parts, from MAHLE / CLEVITE, NISSENS, CSF and 3 other brands. A representative part number is CSF 3974.

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

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

10 Radiator Fan Assembly parts are listed for the 2018 Audi A3, from GPD, SKP, AGILITY and 6 other brands. SKP SK621320 carries the "Popular" badge.

Economy: 2 parts, from SKP and GPD. A representative part number is SKP SK621320.

The Standard Replacement section: 5 options from AGILITY, FOUR SEASONS, NISSENS and 2 other brands. AGILITY 6010318 is listed in this group.

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

This table covers the upper, lower and connecting hoses between radiator, engine and reservoir. Typical signs include swelling, cracks, a soft spot, or a leak at a clamp. Replace adjacent aged hoses while the system is drained — they share the same heat cycle. Read more

2 Radiator Hose parts are listed for the 2018 Audi A3, from DAYCO and REIN.

Listed part numbers: DAYCO 73068 and REIN CHR0794.

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

3 Radiator Mount parts are listed for the 2018 Audi A3, from VNE and REIN.

Listed part numbers: REIN AVM0728, VNE 41000012 and VNE 41000038.

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

22 Temperature Sender / Sensor parts for the 2018 Audi A3 come from 13 brands — STANDARD MOTOR PRODUCTS, BECK/ARNLEY, WALKER PRODUCTS and 10 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS TS608T. 5 parts fit every engine; the other 17 are engine-specific.

The Economy section: 8 options from GPD, HOLSTEIN, STANDARD MOTOR PRODUCTS and 3 other brands. STANDARD MOTOR PRODUCTS TS608T is listed in this group.

Standard Replacement: 14 parts, from BECK/ARNLEY, WALKER PRODUCTS, STANDARD MOTOR PRODUCTS and 5 other brands. A representative part number is BECK/ARNLEY 1580784.

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

16 Thermostat parts are listed for the 2018 Audi A3, from CALORSTAT, MOTORAD, AISIN and 4 other brands. CALORSTAT TH727487 carries the "Popular" badge.

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

12 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2018 Audi A3 come from 6 brands — ELRING, MAHLE / CLEVITE, FEL-PRO and 3 other brands. The "Popular" part is ELRING 453710.

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

3 Thermostat Housing / Water Outlet parts are listed for the 2018 Audi A3, from MOTORAD and FOUR SEASONS.

Part numbers include FOUR SEASONS 86308, MOTORAD CH2074 and 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

7 Water Pump parts are listed for the 2018 Audi A3, from FVP, US MOTOR WORKS, ÜRO PARTS and 3 other brands. US MOTOR WORKS US8124 carries the "Popular" badge.

Economy: 3 parts, from US MOTOR WORKS, FVP and ÜRO PARTS. A representative part number is US MOTOR WORKS US8124.

The Standard Replacement section: 4 options from FOUR SEASONS, FVP, GMB and 1 other brand. FOUR SEASONS 89090 is listed in this group.

This group includes US MOTOR WORKS US8124 and ÜRO PARTS 5Q0121599AA and the remaining parts above.

This table covers the gaskets between the water pump and the block or housing. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for. Read more

4 Water Pump Gasket parts for the 2018 Audi A3 come from ELRING.

Part numbers include ELRING 249150, ELRING 323380 and ELRING 332850, among others listed above.