2025 Cadillac CT4 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 are listed for the 2025 Cadillac CT4, from PRESTONE, VALVOLINE and ACDELCO. PRESTONE AF2100 carries the "Popular" badge. All of them fit every engine offered in the 2025 CT4.

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, PRESTONE and VALVOLINE supply 2 parts: the catalog's value-priced group. A representative part number is PRESTONE AF3100.

The Premium section lists 2 options from PRESTONE — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 5 options from VALVOLINE, PRESTONE and ACDELCO — built to original-equipment specification. VALVOLINE ZXEL1 is listed in this group.

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

4 Coolant Air Bleed Hose / Pipe parts are listed for the 2025 Cadillac CT4, from ACDELCO and GM GENUINE.

This group includes ACDELCO 55503533, ACDELCO 55508978 and GM GENUINE 55494528 and the remaining parts above.

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

21 Coolant Hose / Pipe parts are listed for the 2025 Cadillac CT4, from GM GENUINE and ACDELCO. ACDELCO 55515456 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

2 Coolant Hose / Pipe Seal parts for the 2025 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12623519 and GM GENUINE 12640401.

This table covers the Coolant Hose Connector flanges. Read more

GM GENUINE supplies the 4 Coolant Hose Connector / Flange parts for the 2025 Cadillac CT4. 1 part fits every engine; the other 3 are engine-specific.

Part numbers include GM GENUINE 23333192, GM GENUINE 23171715 and GM GENUINE 84697661, among others listed above.

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

GM GENUINE supplies the 5 Coolant Hose Retainer / Clip parts for the 2025 Cadillac CT4. 1 part fits every engine; the other 4 are engine-specific.

Part numbers include GM GENUINE 11547354, GM GENUINE 88996648 and GM GENUINE 11547862, among others listed above.

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

This group shows a single part: 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

This group shows a single part: 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

This group shows a single part: GATES 31569.

This table covers the brackets that mount the Coolant Reservoir 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

GM GENUINE supplies the 3 Coolant Reservoir Hose Bracket parts for the 2025 Cadillac CT4.

Listed part numbers: GM GENUINE 84093181, GM GENUINE 84210348 and GM GENUINE 84333508.

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

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 13596789.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 11 Hose Clamp parts for the 2025 Cadillac CT4. GM GENUINE 11570871 carries the "Popular" badge. 5 parts fit every engine; the other 6 are engine-specific.

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

GM GENUINE supplies the 3 Intercooler parts for the 2025 Cadillac CT4. 1 part fits every engine; the other 2 are engine-specific.

Part numbers include GM GENUINE 84750051, GM GENUINE 84577608 and GM GENUINE 12640408.

This table covers the Intercooler Air Hose pipes. Read more

GM GENUINE supplies the 4 Intercooler Air Hose / Pipe parts for the 2025 Cadillac CT4.

Listed part numbers: GM GENUINE 84009657, GM GENUINE 12672014 and GM GENUINE 12672017, plus the other parts above.

This table covers the brackets that mount the Intercooler Hose / Pipe. 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 CT4 — GM GENUINE 84333509.

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

This group shows a single part: GM GENUINE 13438980.

This table covers the Intercooler retainers and clips. Read more

This group shows a single part: GM GENUINE 11548857.

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

5 Radiator parts are listed for the 2025 Cadillac CT4, from GM GENUINE and GPD.

Economy: 1 part, from GPD. A representative part number is GPD 13889C.

The Standard Replacement section: 1 option from GM GENUINE. GM GENUINE 84511252 is listed in this group.

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

This group includes GPD 13889C, GM GENUINE 84511252 and GM GENUINE 84908880 and the remaining 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

One part is listed for the 2025 Cadillac CT4 — ACDELCO RC124.

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

This group shows a single part: 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

10 Radiator Hose parts for the 2025 Cadillac CT4 come from ACDELCO.

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

4 Radiator Hose Bracket parts for the 2025 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 84073805, GM GENUINE 84210352 and GM GENUINE 84210353, among others listed above.

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

3 Radiator Mount Bracket parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: 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 are listed for the 2025 Cadillac CT4, from GM GENUINE, WELLS, STANDARD MOTOR PRODUCTS and 2 other brands. GM GENUINE 55488246 carries the "Popular" badge.

Economy: 1 part, from HOLSTEIN. A representative part number is HOLSTEIN 2CTS0187.

The Standard Replacement section: 3 options from GM GENUINE, STANDARD MOTOR PRODUCTS and WELLS. GM GENUINE 12656444 is listed in this group.

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

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 2025 Cadillac CT4 — 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

4 Thermostat parts for the 2025 Cadillac CT4 come from 2 brands — MOTORAD and DORMAN.

The Economy section: 1 option from DORMAN. DORMAN 9022123 is listed in this group.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD 992180.

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

This group includes DORMAN 9022123, MOTORAD 992180 and MOTORAD 1335000 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

6 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2025 Cadillac CT4, from GM GENUINE and ELRING. GM GENUINE 1532584 carries the "Popular" badge.

This group includes GM GENUINE 1532584, ELRING 564430 and GM GENUINE 12681140 and the remaining parts above.

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

2 Thermostat Housing / Water Outlet parts for the 2025 Cadillac CT4 come from GM GENUINE.

Part numbers include GM GENUINE 12690765 and GM GENUINE 12690768.

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

One part is listed for the 2025 Cadillac CT4 — GM GENUINE 55504553.

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

4 Water Pump parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12738954, GM GENUINE 12746198 and GM GENUINE 13541834, plus the other 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

2 Water Pump Gasket parts are listed for the 2025 Cadillac CT4, from ACDELCO and GM GENUINE.

Part numbers include ACDELCO 2512075 and GM GENUINE 2512052.

This table covers the Water Pump housings. Read more

3 Water Pump Housing parts are listed for the 2025 Cadillac CT4, from ACDELCO and GM GENUINE.

This group includes ACDELCO 55501820, ACDELCO 12682815 and GM GENUINE 55503850.

This table covers the Water Pump Inlet tubes. Read more

This group shows a single part: GM GENUINE 55487350.

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 2025 Cadillac CT4 — 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

2 Water Pump Seal / O-Ring parts for the 2025 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 12668035 and GM GENUINE 12691259.