2025 Cadillac CT5 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

10 Coolant / Antifreeze parts for the 2025 Cadillac CT5 come from 3 brands — PRESTONE, VALVOLINE and ACDELCO. The "Popular" part is PRESTONE AF2100. Every part fits all 3 engine options (2.0L L4 Turbocharged, 3.0L V6 Turbocharged and 6.2L V8 Supercharged).

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 2 options from PRESTONE and VALVOLINE — the catalog's value-priced group. PRESTONE AF3100 is listed in this group.

In the Premium grade, PRESTONE supplies 2 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is PRESTONE AF2100.

In the Standard Replacement grade, VALVOLINE, PRESTONE and ACDELCO supply 5 parts: built to original-equipment specification. A representative part number is VALVOLINE ZXEL1.

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

6 Coolant Air Bleed Hose / Pipe parts for the 2025 Cadillac CT5 come from 2 brands — GM GENUINE and ACDELCO.

Part numbers include ACDELCO 55503533, ACDELCO 55508978 and GM GENUINE 55494528, among others listed above.

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

13 Coolant Hose / Pipe parts for the 2025 Cadillac CT5 come from 2 brands — GM GENUINE and ACDELCO. The "Popular" part is ACDELCO 55515456. 1 part fits every engine; the other 12 are engine-specific.

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

GM GENUINE supplies both parts for the 2025 Cadillac CT5.

Listed part numbers: GM GENUINE 12659280 and GM GENUINE 12623519.

This table covers the Coolant Hose Connector flanges. Read more

3 Coolant Hose Connector / Flange parts for the 2025 Cadillac CT5 come from GM GENUINE.

Listed part numbers: GM GENUINE 23333192, GM GENUINE 23171715 and GM GENUINE 1533814.

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 2025 Cadillac CT5 — ELRING 237180.

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

4 Coolant Hose Retainer / Clip parts for the 2025 Cadillac CT5 come from GM GENUINE.

This group includes GM GENUINE 11547354, GM GENUINE 11547862 and GM GENUINE 11548857 and the remaining parts above.

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

One part is listed for the 2025 Cadillac CT5 — GM GENUINE 23378398.

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

One part is listed for the 2025 Cadillac CT5 — GM GENUINE 84805610.

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

One part is listed for the 2025 Cadillac CT5 — GATES 31569.

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

This group shows a single part: GM GENUINE 13596789.

This table covers the Hose clamps. Read more

12 Hose Clamp parts for the 2025 Cadillac CT5 come from GM GENUINE. The "Popular" part is GM GENUINE 11570871. 4 parts fit every engine; the other 8 are engine-specific.

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

4 Intercooler parts for the 2025 Cadillac CT5 come from GM GENUINE.

This group includes GM GENUINE 84750051, GM GENUINE 42800582 and GM GENUINE 12699267 and the remaining parts above.

This table covers the Intercooler Air Hose pipes. Read more

3 Intercooler Air Hose / Pipe parts for the 2025 Cadillac CT5 come from GM GENUINE.

Part numbers include GM GENUINE 84009657, GM GENUINE 12672331 and GM GENUINE 12672333.

This table covers the Intercooler covers. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT5.

Listed part numbers: GM GENUINE 12729230 and GM GENUINE 12712266.

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

GM GENUINE supplies the 4 Intercooler Gasket parts for the 2025 Cadillac CT5.

Part numbers include GM GENUINE 12652026, GM GENUINE 12652017 and GM GENUINE 12642745, among others listed above.

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

GM GENUINE supplies both parts for the 2025 Cadillac CT5.

This group includes GM GENUINE 13438980 and GM GENUINE 12661079.

This table covers the Intercooler retainers and clips. Read more

One part is listed for the 2025 Cadillac CT5 — GM GENUINE 88996648.

This table covers the seals at the Intercooler. 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 Cadillac CT5 — GM GENUINE 12608997.

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

8 Radiator parts for the 2025 Cadillac CT5 come from 3 brands — GM GENUINE, GPD and FVP.

The Economy section: 2 options from GPD. GPD 13889C is listed in this group.

Standard Replacement: 4 parts, from GM GENUINE and FVP. A representative part number is FVP RAD13889.

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

Listed part numbers: GPD 13889C, GPD 13896C and FVP RAD13889, plus the other parts above.

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

This group shows a single part: ACDELCO RC124.

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

One part is listed for the 2025 Cadillac CT5 — GM GENUINE 22790134.

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

One part is listed for the 2025 Cadillac CT5 — GM GENUINE 85080140.

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

ACDELCO supplies the 4 Radiator Hose parts for the 2025 Cadillac CT5.

Listed part numbers: ACDELCO 84805594, ACDELCO 84615567 and ACDELCO 84819023, plus the other parts above.

This table covers the brackets that mount the Radiator Hose. 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

One part is listed for the 2025 Cadillac CT5 — GM GENUINE 84288925.

This table covers the brackets that mount the Radiator Mount. 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

GM GENUINE supplies the 3 Radiator Mount Bracket parts for the 2025 Cadillac CT5.

This group includes GM GENUINE 84849419, GM GENUINE 84849420 and GM GENUINE 84849421.

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 for the 2025 Cadillac CT5 come from 5 brands — HOLSTEIN, GM GENUINE, STANDARD MOTOR PRODUCTS and 2 other brands. The "Popular" part is GM GENUINE 55488246.

The Economy section: 5 options from HOLSTEIN and ULTRA-POWER. HOLSTEIN 2CTS0331 is listed in this group.

Standard Replacement: 10 parts, from GM GENUINE, STANDARD MOTOR PRODUCTS and WELLS. A representative part number is GM GENUINE 55488246.

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

8 Thermostat parts are listed for the 2025 Cadillac CT5, from SKP, MOTORAD, AUTOTECNICA and 3 other brands. GM GENUINE 1511113 carries the "Popular" badge.

Economy: 4 parts, from SKP, AUTOTECNICA and DORMAN. A representative part number is AUTOTECNICA GM0720833.

The Standard Replacement section: 3 options from GM GENUINE, FOUR SEASONS and MOTORAD. GM GENUINE 1511113 is listed in this group.

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

Part numbers include GM GENUINE 1511113, AUTOTECNICA GM0720833 and DORMAN 9022114, among others listed 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

6 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2025 Cadillac CT5 come from 2 brands — GM GENUINE and ELRING. The "Popular" part is GM GENUINE 1534732.

This group includes GM GENUINE 1534732, ELRING 049130 and ELRING 048290 and the remaining parts above.

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

3 Thermostat Housing / Water Outlet parts are listed for the 2025 Cadillac CT5, from ACDELCO, GATES and GM GENUINE.

Part numbers include ACDELCO 1511109, GATES CO35104 and GM GENUINE 12741007.

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

2 Water Inlet Gasket parts for the 2025 Cadillac CT5 come from GM GENUINE.

This group includes GM GENUINE 55504553 and GM GENUINE 12647400.

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

11 Water Pump parts are listed for the 2025 Cadillac CT5, from GM GENUINE, FVP, GMB and 1 other brand. GATES 43326 carries the "Popular" badge.

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 2025 Cadillac CT5 come from 2 brands — GM GENUINE and ELRING.

Listed part numbers: ELRING 237160, GM GENUINE 2512072 and GM GENUINE 2512066, plus the other parts above.

This table covers the Water Pump housings. Read more

2 Water Pump Housing parts for the 2025 Cadillac CT5 come from 2 brands — ACDELCO and GM GENUINE.

This group includes ACDELCO 55501820 and GM GENUINE 55503850.

This table covers the Water Pump Inlet tubes. Read more

GM GENUINE supplies both parts for the 2025 Cadillac CT5.

Part numbers include GM GENUINE 55487350 and 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

This group shows a single part: 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

GM GENUINE supplies the 3 Water Pump Seal / O-Ring parts for the 2025 Cadillac CT5.

This group includes GM GENUINE 12646952, GM GENUINE 12646951 and GM GENUINE 12649987.