2018 Audi A4 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 2018 Audi A4, from PRESTONE, PEAK, PENTOSIN and 3 other brands. FVP MV5050GAL carries the "Popular" badge.

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

5 Coolant Hose / Pipe parts are listed for the 2018 Audi A4, from REIN, ÜRO PARTS and VAICO. REIN CHP0663 carries the "Popular" badge.

Listed part numbers: REIN CHP0663, REIN CHE0882 and ÜRO PARTS 06L121131PRM, plus the other 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 for the 2018 Audi A4 come from 3 brands — MAHLE / CLEVITE, AJUSA and DORMAN. The "Popular" part is MAHLE / CLEVITE C32208.

This group includes MAHLE / CLEVITE C32208, AJUSA 16098500 and DORMAN 47451 and the remaining parts above.

This table covers the Coolant Hose Connector flanges. Read more

6 Coolant Hose Connector / Flange parts are listed for the 2018 Audi A4, from REIN, DORMAN, SKP and 2 other brands. DORMAN 627006 carries the "Popular" badge.

Economy: 2 parts, from DORMAN and SKP. A representative part number is DORMAN 627006.

The Standard Replacement section: 4 options from REIN, MOTORAD and VAICO. MOTORAD CH8016 is listed in this group.

Part numbers include DORMAN 627006, SKP SK627006 and MOTORAD CH8016, among others listed above.

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 2018 Audi A4 — ÜRO PARTS 357121140.

This table covers the Coolant Pipe adapters. Read more

This group shows a single part: ÜRO PARTS 06K121143PRM.

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

5 Coolant Reservoir parts for the 2018 Audi A4 come from 5 brands — ÜRO PARTS, HELLA, MAHLE / CLEVITE and 2 other brands. The "Popular" part is ÜRO PARTS 8W0121405L.

Part numbers include ÜRO PARTS 8W0121405L, HELLA 366365681 and MAHLE / CLEVITE CRT255000S, among others listed 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

2 Coolant Reservoir Cap parts for the 2018 Audi A4 come from 2 brands — MOTORAD and ÜRO PARTS.

Part numbers include MOTORAD T111 and ÜRO PARTS 4M0121321Q.

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

6 Intercooler parts are listed for the 2018 Audi A4, from NISSENS, TYC, GPD and 3 other brands. NISSENS 961466 carries the "Popular" badge.

Listed part numbers: NISSENS 961466, TYC 18100 and GPD 2711413, plus the other 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

9 Radiator parts are listed for the 2018 Audi A4, from NISSENS, GPD, VEMO and 5 other brands. KOYORAD A13665 carries the "Popular" badge.

Economy: 2 parts, from GPD and VEMO. A representative part number is GPD 13665.

The Standard Replacement section: 7 options from NISSENS, KOYORAD, TYC and 3 other brands. KOYORAD A13665 is listed in this group.

Listed part numbers: KOYORAD A13665, GPD 13665 and VEMO V10600108, plus the other parts above.

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

8 Radiator Fan Assembly parts for the 2018 Audi A4 come from 4 brands — TECHPRO, VEMO, GPD and 1 other brand. The "Popular" part is UAC FA50946C.

The Economy section: 7 options from TECHPRO, VEMO and GPD. GPD 2812266 is listed in this group.

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

Part numbers include UAC FA50946C, GPD 2812266 and TECHPRO AU3115113, 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 2018 Audi A4 — SKP SK621318.

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

3 Radiator Hose parts for the 2018 Audi A4 come from 2 brands — GATES and ÜRO PARTS.

Listed part numbers: GATES 51878, GATES 52459 and ÜRO PARTS 06L121081K.

This table covers the Radiator insulators. Read more

2 Radiator Insulator parts for the 2018 Audi A4 come from VNE.

This group includes 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

18 Temperature Sender / Sensor parts are listed for the 2018 Audi A4, from STANDARD MOTOR PRODUCTS, GPD, HOLSTEIN and 8 other brands. STANDARD MOTOR PRODUCTS TS608T carries the "Popular" badge.

Economy: 7 parts, from GPD, HOLSTEIN, STANDARD MOTOR PRODUCTS and 2 other brands. A representative part number is STANDARD MOTOR PRODUCTS TS608T.

The Standard Replacement section: 11 options from BECK/ARNLEY, STANDARD MOTOR PRODUCTS, VNE and 4 other brands. BECK/ARNLEY 1580784 is listed in this group.

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

5 Thermostat parts for the 2018 Audi A4 come from 5 brands — SKP, MOTORAD, BECK/ARNLEY and 2 other brands. The "Popular" part is MOTORAD 838235.

The Economy section: 1 option from SKP. SKP SK121111 is listed in this group.

Standard Replacement: 4 parts, from MOTORAD, BECK/ARNLEY, CALORSTAT and 1 other brand. A representative part number is MOTORAD 838235.

This group includes MOTORAD 838235, SKP SK121111 and BECK/ARNLEY 1430913 and the remaining parts 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

3 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2018 Audi A4, from MAHLE / CLEVITE and AJUSA.

Part numbers include AJUSA 16502300, MAHLE / CLEVITE 72622 and MAHLE / CLEVITE C33480.

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

3 Thermostat Housing / Water Outlet parts for the 2018 Audi A4 come from 3 brands — GATES, MOTORAD and VEMO.

This group includes GATES CO34954, MOTORAD CH3116 and VEMO V15992053.

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 2018 Audi A4 come from 11 brands — PIERBURG, BECK/ARNLEY, GATES and 8 other brands. The "Popular" part is US MOTOR WORKS US8124.

The Economy section: 5 options from BECK/ARNLEY, US MOTOR WORKS, FVP and 1 other brand. US MOTOR WORKS US8124 is listed in this group.

Standard Replacement: 11 parts, from PIERBURG, GATES, FOUR SEASONS and 4 other brands. A representative part number is GATES 42209.