2018 Cadillac XTS 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 Cadillac XTS, from PRESTONE, PEAK, VALVOLINE and 3 other brands. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2018 XTS.

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

The Premium section lists 4 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 7 options from VALVOLINE, PRESTONE, ACDELCO and 2 other brands — built to original-equipment specification. ACDELCO 105027 is listed in this group.

This table covers the Coolant Air Bleed Hose pipes. Read more

GM GENUINE supplies the 3 Coolant Air Bleed Hose / Pipe parts for the 2018 Cadillac XTS.

Part numbers include GM GENUINE 12637185, GM GENUINE 12637183 and GM GENUINE 12638449.

This table covers the bleeders used to purge air from the coolant circuit. Read more

2 Coolant Air Bleeder parts for the 2018 Cadillac XTS come from 2 brands — DORMAN and GM GENUINE. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include DORMAN 626588 and GM GENUINE 13267637.

This table covers the Coolant Bleed Hose fittings. Read more

GM GENUINE supplies both parts for the 2018 Cadillac XTS.

This group includes GM GENUINE 12637187 and GM GENUINE 12637192.

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

6 Coolant Hose / Pipe parts are listed for the 2018 Cadillac XTS, from GM GENUINE and CONTINENTAL. CONTINENTAL 64310 carries the "Popular" badge. 2 parts fit every engine; the other 4 are engine-specific.

Part numbers include CONTINENTAL 64310, CONTINENTAL 63080 and GM GENUINE 22965100, among others listed 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

2 Coolant Hose / Pipe Seal parts for the 2018 Cadillac XTS come from 2 brands — ELRING and GM GENUINE. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include ELRING 943630 and GM GENUINE 12640401.

This table covers the Coolant Hose Connector flanges. Read more

2 Coolant Hose Connector / Flange parts are listed for the 2018 Cadillac XTS, from DORMAN and GM GENUINE. All of them fit every engine offered in the 2018 XTS.

Economy: 1 part, from DORMAN. A representative part number is DORMAN 9022091.

The Standard Replacement section: 1 option from GM GENUINE. GM GENUINE 20847910 is listed in this group.

Part numbers include DORMAN 9022091 and GM GENUINE 20847910.

This table covers the gaskets that seal the Coolant Pipe. 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

This group shows a single part: AJUSA 01154600.

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

7 Coolant Reservoir parts for the 2018 Cadillac XTS come from 6 brands — TECHPRO, DORMAN, AUTOTECNICA and 3 other brands. The "Popular" part is DORMAN 603385. Every part fits both the 3.6L V6 and the 3.6L V6 Turbocharged.

This group includes DORMAN 603385, AUTOTECNICA GM0713819 and GM GENUINE 22950436 and the remaining 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

9 Coolant Reservoir Cap parts for the 2018 Cadillac XTS come from 7 brands — AUTOTECNICA, MOTORAD, DORMAN and 4 other brands. The "Popular" part is DORMAN 54218. 6 parts fit every engine; the other 3 are engine-specific.

Listed part numbers: DORMAN 54218, SKP SK54218 and AUTOTECNICA GM0714619, plus the other parts above.

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

One part is listed for the 2018 Cadillac XTS — GM GENUINE 13284504.

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

MOTORAD supplies both parts for the 2018 Cadillac XTS. All of them fit every engine offered in the 2018 XTS.

Part numbers include MOTORAD 3128 and MOTORAD 3127.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 6 Hose Clamp parts for the 2018 Cadillac XTS. GM GENUINE 13162312 carries the "Popular" badge. 3 parts fit every engine; the other 3 are engine-specific.

Part numbers include GM GENUINE 13162312, GM GENUINE 11570614 and GM GENUINE 90572587, among others listed above.

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

5 Intercooler parts are listed for the 2018 Cadillac XTS, from TECHPRO, GM GENUINE and GPD. 1 part fits every engine; the other 4 are engine-specific.

Economy: 1 part, from TECHPRO. A representative part number is TECHPRO GM3012115.

The Standard Replacement section: 2 options from GM GENUINE. GM GENUINE 12640408 is listed in this group.

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

This group includes TECHPRO GM3012115, GM GENUINE 12640408 and GM GENUINE 20982750 and the remaining parts above.

This table covers the Intercooler Air Hose pipes. Read more

One part is listed for the 2018 Cadillac XTS — GM GENUINE 12643106.

This table covers the Intercooler covers. Read more

This group shows a single part: GM GENUINE 12661212.

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

10 Radiator parts are listed for the 2018 Cadillac XTS, from KOYORAD, DENSO, TYC and 5 other brands. DENSO 2219328 carries the "Popular" badge. 2 parts fit every engine; the other 8 are engine-specific.

This table covers the caps that hold system pressure at the radiator or reservoir neck. 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

3 Radiator Cap parts are listed for the 2018 Cadillac XTS, from ACDELCO, GM GENUINE and PROFESSIONAL PARTS SWEDEN. 2 parts fit every engine; the other 1 is engine-specific.

This group includes ACDELCO RC124, GM GENUINE 15544596 and PROFESSIONAL PARTS SWEDEN 21342353.

This table covers the petcocks used to drain the radiator. Read more

This group shows a single part: GM GENUINE 22790134.

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

9 Radiator Fan Assembly parts for the 2018 Cadillac XTS come from 7 brands — GM GENUINE, DORMAN, GPD and 4 other brands. The "Popular" part is DORMAN 620971. 2 parts fit every engine; the other 7 are engine-specific.

The Economy section: 4 options from DORMAN, GPD, SKP and 1 other brand. DORMAN 620971 is listed in this group.

Standard Replacement: 5 parts, from GM GENUINE, TYC and UAC. A representative part number is TYC 622790.

Listed part numbers: DORMAN 620971, GPD 2811869 and SKP SK620971, plus the other parts above.

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

13 Radiator Hose parts for the 2018 Cadillac XTS come from 5 brands — ACDELCO, GATES, CONTINENTAL and 2 other brands. The "Popular" part is ACDELCO 23203513. 11 parts fit every engine; the other 2 are engine-specific.

This table covers the Radiator insulators. Read more

This group shows a single part: GM GENUINE 13306606.

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: GM GENUINE 52493483.

This table covers the Radiator Mount bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles. Read more

3 Radiator Mount Bushing parts for the 2018 Cadillac XTS come from 3 brands — DORMAN, SKP and ULTRA-POWER. 2 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: DORMAN 926280 and SKP SK926280, plus the other parts above.

This table covers the seals at the Radiator. 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 Radiator Seal parts for the 2018 Cadillac XTS come from GM GENUINE.

Part numbers include GM GENUINE 20942543 and GM GENUINE 22826569.

This table covers the Radiator Upper Air Baffle retainers and clips. Read more

2 Radiator Upper Air Baffle Retainer / Clip parts for the 2018 Cadillac XTS come from DORMAN. Every part fits both the 3.6L V6 and the 3.6L V6 Turbocharged.

Part numbers include DORMAN 700365 and DORMAN 963058.

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 Cadillac XTS, from WALKER PRODUCTS, HOLSTEIN, GM GENUINE and 8 other brands. WALKER PRODUCTS 21191118 carries the "Popular" badge. 7 parts fit every engine; the other 11 are engine-specific.

Economy: 4 parts, from HOLSTEIN, GPD and UNITED MOTOR PRODUCTS. A representative part number is GPD 1712905.

In the Full Service Kit grade, WALKER PRODUCTS supplies 1 part: grouped under the catalog's "Full Service Kit" designation — the notes column spells out what sets them apart. A representative part number is WALKER PRODUCTS 21191118.

The Standard Replacement section: 13 options from GM GENUINE, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 5 other brands. BECK/ARNLEY 1580733 is listed in this group.

This table covers the Temperature Sender / Sensor clips. Read more

One part is listed for the 2018 Cadillac XTS — DORMAN 66264.

This table covers the Temperature Sender / Sensor O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

One part is listed for the 2018 Cadillac XTS — GM GENUINE 12639042.

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

11 Thermostat parts for the 2018 Cadillac XTS come from 6 brands — MOTORAD, GATES, FOUR SEASONS and 3 other brands. The "Popular" part is GATES 34841.

The Economy section: 2 options from AUTOTECNICA and SKP. AUTOTECNICA GM0720267 is listed in this group.

Standard Replacement: 4 parts, from MOTORAD, GATES and FOUR SEASONS. A representative part number is GATES 34841.

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

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

19 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2018 Cadillac XTS, from FEL-PRO, APEX, GM GENUINE and 3 other brands. FEL-PRO 35855 carries the "Popular" badge. 17 parts fit every engine; the other 2 are engine-specific.

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

6 Thermostat Housing / Water Outlet parts for the 2018 Cadillac XTS come from 4 brands — GM GENUINE, GATES, MOTORAD and 1 other brand. The "Popular" part is GM GENUINE 1581939. 3 parts fit every engine; the other 3 are engine-specific.

Listed part numbers: GM GENUINE 1581939, GATES CO35096 and GM GENUINE 1511053, plus the other parts above.

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

13 Water Pump parts for the 2018 Cadillac XTS come from 11 brands — GM GENUINE, SKP, CARTER and 8 other brands. The "Popular" part is SKP SK1305130. 11 parts fit every engine; the other 2 are engine-specific.

The Economy section: 5 options from SKP, CARTER, ENGINETECH and 2 other brands. SKP SK1305130 is listed in this group.

Standard Replacement: 8 parts, from GM GENUINE, GATES, ACDELCO and 3 other brands. A representative part number is GATES 43530.

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

5 Water Pump Gasket parts are listed for the 2018 Cadillac XTS, from GM GENUINE, APEX, FEL-PRO and 2 other brands. GM GENUINE 2512052 carries the "Popular" badge. 4 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: GM GENUINE 2512052, APEX AWP3231 and FEL-PRO 35859, plus the other parts above.

This table covers the Water Pump pulleys. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt. Read more

One part is listed for the 2018 Cadillac XTS — GM GENUINE 12611587.

This table covers the Water Pump Seal O-rings. Typical signs include a seep at a fitting or a housing that weeps after a service. Lube the new O-ring with the fluid it will see, and do not roll it into the groove. Read more

This group shows a single part: GM GENUINE 12691259.