2018 Cadillac CT6 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 CT6, from PRESTONE, PEAK, VALVOLINE and 3 other brands. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2018 CT6.

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 5 Coolant Air Bleed Hose / Pipe parts for the 2018 Cadillac CT6.

Listed part numbers: GM GENUINE 12634280, GM GENUINE 12683453 and GM GENUINE 84141562, plus the other parts above.

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

This group shows a single part: GM GENUINE 20876185.

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

13 Coolant Hose / Pipe parts are listed for the 2018 Cadillac CT6, from GM GENUINE and ACDELCO. GM GENUINE 12627054 carries the "Popular" badge.

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 Cadillac CT6 come from 3 brands — GM GENUINE, FEL-PRO and MAHLE / CLEVITE.

Listed part numbers: FEL-PRO 36156, GM GENUINE 12627055 and GM GENUINE 12659280, plus the other parts above.

This table covers the Coolant Hose Connector flanges. Read more

2 Coolant Hose Connector / Flange parts are listed for the 2018 Cadillac CT6, from FOUR SEASONS and GM GENUINE.

Part numbers include FOUR SEASONS 86373 and GM GENUINE 23489856.

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

This group shows a single part: ELRING 237180.

This table covers the Coolant Pipe adapters. Read more

This group shows a single part: GM GENUINE 1534890.

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

2 Coolant Reservoir parts for the 2018 Cadillac CT6 come from GM GENUINE.

Part numbers include GM GENUINE 22885796 and GM GENUINE 22970513.

This table covers the brackets that mount the Coolant Reservoir. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners. Read more

2 Coolant Reservoir Bracket parts for the 2018 Cadillac CT6 come from GM GENUINE.

Listed part numbers: GM GENUINE 23118977 and GM GENUINE 23110407.

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

10 Coolant Reservoir Cap parts for the 2018 Cadillac CT6 come from 7 brands — MOTORAD, AUTOTECNICA, DORMAN and 4 other brands. The "Popular" part is DORMAN 54218. 3 parts fit every engine; the other 7 are engine-specific.

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

One part is listed for the 2018 Cadillac CT6 — GM GENUINE 13284504.

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

3 Cooling System Tester Adapter parts are listed for the 2018 Cadillac CT6, from MOTORAD and GATES.

This group includes GATES 31391, MOTORAD 3128 and MOTORAD 3127.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 8 Hose Clamp parts for the 2018 Cadillac CT6. GM GENUINE 90572594 carries the "Popular" badge. 1 part fits every engine; the other 7 are engine-specific.

Part numbers include GM GENUINE 90572594, GM GENUINE 11570871 and GM GENUINE 90572595, 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 CT6, from GM GENUINE and GPD.

This group includes GM GENUINE 23385892, GM GENUINE 12673394 and GM GENUINE 12673393 and the remaining parts above.

This table covers the gaskets that seal the Intercooler. 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

2 Intercooler Gasket parts for the 2018 Cadillac CT6 come from GM GENUINE.

Listed part numbers: GM GENUINE 12652026 and GM GENUINE 12652017.

This table covers the Intercooler Hose / Pipe clamps. Read more

This group shows a single part: GM GENUINE 12662824.

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

This group shows a single part: GM GENUINE 23385893.

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 2018 Cadillac CT6, from GM GENUINE, KOYORAD, AGILITY and 4 other brands. GM GENUINE 21901 carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 13623C.

The Standard Replacement section: 5 options from GM GENUINE, KOYORAD, AGILITY and 2 other brands. GM GENUINE 21901 is listed in this group.

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

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 CT6, from ACDELCO, GATES and PROFESSIONAL PARTS SWEDEN. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include ACDELCO RC124, GATES 31569 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 23444086.

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

3 Radiator Fan Assembly parts for the 2018 Cadillac CT6 come from 3 brands — GPD, TECHPRO and VEMO.

Part numbers include GPD 2812170, TECHPRO GM3115300 and VEMO V57010003.

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

8 Radiator Hose parts for the 2018 Cadillac CT6 come from 3 brands — ACDELCO, GM GENUINE and CONTINENTAL.

Listed part numbers: ACDELCO 23307856, ACDELCO 12671842 and ACDELCO 84167086, plus the other parts above.

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

This group shows a single part: DORMAN 961364.

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

15 Temperature Sender / Sensor parts are listed for the 2018 Cadillac CT6, from GPD, GM GENUINE, VEMO and 5 other brands. GM GENUINE 12641073 carries the "Popular" badge.

Economy: 6 parts, from GPD, VEMO and HOLSTEIN. A representative part number is GPD 1712640.

The Standard Replacement section: 9 options from GM GENUINE, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 2 other brands. GM GENUINE 12641073 is listed in this group.

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

One part is listed for the 2018 Cadillac CT6 — 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 CT6 — 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

15 Thermostat parts for the 2018 Cadillac CT6 come from 7 brands — GATES, MOTORAD, AUTOTECNICA and 4 other brands. The "Popular" part is GATES 34717.

The Economy section: 5 options from AUTOTECNICA, SKP and DORMAN. AUTOTECNICA GM0720261 is listed in this group.

Standard Replacement: 9 parts, from MOTORAD, GATES, CALORSTAT and 1 other brand. A representative part number is GATES 34717.

1 further part sits 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

13 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2018 Cadillac CT6, from GM GENUINE, FEL-PRO, ELRING and 2 other brands. GM GENUINE 12630780 carries the "Popular" badge.

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

12 Thermostat Housing / Water Outlet parts for the 2018 Cadillac CT6 come from 7 brands — GM GENUINE, GATES, ACDELCO and 4 other brands. The "Popular" part is DORMAN 9022134.

The Economy section: 2 options from DORMAN and SKP. DORMAN 9022134 is listed in this group.

Standard Replacement: 5 parts, from GM GENUINE, ACDELCO, FOUR SEASONS and 1 other brand. A representative part number is GM GENUINE 1511084.

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

This table covers the gaskets that seal the Water Inlet. 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

3 Water Inlet Gasket parts are listed for the 2018 Cadillac CT6, from FEL-PRO, GM GENUINE and MAHLE / CLEVITE.

Listed part numbers: FEL-PRO 36167, GM GENUINE 12647400 and MAHLE / CLEVITE C33508.

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

21 Water Pump parts for the 2018 Cadillac CT6 come from 10 brands — US MOTOR WORKS, FVP, GM GENUINE and 7 other brands. The "Popular" part is US MOTOR WORKS US8102.

The Economy section: 10 options from US MOTOR WORKS, FVP, SKP and 1 other brand. US MOTOR WORKS US8102 is listed in this group.

Standard Replacement: 11 parts, from GM GENUINE, ACDELCO, DAYCO and 3 other brands. A representative part number is ACDELCO 2521009.

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

9 Water Pump Gasket parts are listed for the 2018 Cadillac CT6, from GM GENUINE, ELRING, FEL-PRO and 1 other brand. GM GENUINE 2512072 carries the "Popular" badge.

This group includes GM GENUINE 2512072, ELRING 048370 and ELRING 048320 and the remaining parts above.

This table covers the Water Pump Inlet tubes. Read more

This group shows a single part: GM GENUINE 12706857.

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 CT6 — GM GENUINE 12652047.

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

3 Water Pump Seal / O-Ring parts for the 2018 Cadillac CT6 come from GM GENUINE.

Listed part numbers: GM GENUINE 12646951, GM GENUINE 12646952 and GM GENUINE 12649987.