2021 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

16 Coolant / Antifreeze parts are listed for the 2021 Cadillac CT4, from PRESTONE, PEAK, VALVOLINE and 3 other brands. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2021 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, 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

4 Coolant Air Bleed Hose / Pipe parts are listed for the 2021 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

16 Coolant Hose / Pipe parts are listed for the 2021 Cadillac CT4, from GM GENUINE and ACDELCO. ACDELCO 55515456 carries the "Popular" badge.

This table covers the Coolant Hose Connector flanges. Read more

GM GENUINE supplies the 4 Coolant Hose Connector / Flange parts for the 2021 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 12693960, among others listed above.

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

GM GENUINE supplies the 4 Coolant Hose Retainer / Clip parts for the 2021 Cadillac CT4. 1 part fits every engine; the other 3 are engine-specific.

Part numbers include GM GENUINE 11547354, GM GENUINE 11547445 and GM GENUINE 88996648, 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

6 Coolant Reservoir Cap parts for the 2021 Cadillac CT4 come from 6 brands — DORMAN, SKP, AUTOTECNICA and 3 other brands. The "Popular" part is DORMAN 54218. 4 parts fit every engine; the other 2 are engine-specific.

Part numbers include DORMAN 54218, SKP SK54218 and AUTOTECNICA GM0714619, among others listed above.

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

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 84093181.

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

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 13596789.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 12 Hose Clamp parts for the 2021 Cadillac CT4. GM GENUINE 11570871 carries the "Popular" badge. 8 parts fit every engine; the other 4 are engine-specific.

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

GM GENUINE supplies both parts for the 2021 Cadillac CT4. All of them fit every engine offered in the 2021 CT4.

This group includes GM GENUINE 84750051 and GM GENUINE 84577608.

This table covers the Intercooler Air Hose pipes. Read more

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 84009657.

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 2021 Cadillac CT4 — GM GENUINE 84849419.

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

This group shows a single part: GM GENUINE 13438980.

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 2021 Cadillac CT4, from GM GENUINE, GPD, FVP and 1 other brand.

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

The Standard Replacement section: 3 options from FVP, GM GENUINE and UAC. FVP RAD13889 is listed in this group.

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

Part numbers include GPD 13889C, FVP RAD13889 and GM GENUINE 84511252, among others listed 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

2 Radiator Cap parts are listed for the 2021 Cadillac CT4, from ACDELCO and PROFESSIONAL PARTS SWEDEN. All of them fit every engine offered in the 2021 CT4.

Part numbers include ACDELCO RC124 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

2 Radiator Fan Assembly parts for the 2021 Cadillac CT4 come from 2 brands — TECHPRO and GM GENUINE. Every part fits both the 2.0L L4 Turbocharged and the 2.7L L4 Turbocharged.

The Economy section: 1 option from TECHPRO. TECHPRO GM3115355 is listed in this group.

Standard Replacement: 1 part, from GM GENUINE. A representative part number is GM GENUINE 85080140.

This group includes TECHPRO GM3115355 and 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

7 Radiator Hose parts for the 2021 Cadillac CT4 come from ACDELCO.

Part numbers include ACDELCO 84697666, ACDELCO 84697669 and ACDELCO 84697668, among others listed 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

3 Radiator Hose Bracket parts for the 2021 Cadillac CT4 come from GM GENUINE.

Listed part numbers: GM GENUINE 84073805, GM GENUINE 84210352 and GM GENUINE 84210353.

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

This group shows a single part: GM GENUINE 84849419.

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 2021 Cadillac CT4, from HOLSTEIN, GM GENUINE, WALKER PRODUCTS and 4 other brands. GM GENUINE 55488246 carries the "Popular" badge. 5 parts fit every engine; the other 13 are engine-specific.

Economy: 5 parts, from HOLSTEIN and GPD. A representative part number is GPD 1814558.

The Standard Replacement section: 13 options from GM GENUINE, WALKER PRODUCTS, STANDARD MOTOR PRODUCTS and 2 other brands. GM GENUINE 55488246 is listed in this group.

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

One part is listed for the 2021 Cadillac CT4 — DORMAN 66264.

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

2 Thermostat parts for the 2021 Cadillac CT4 come from MOTORAD.

This group includes MOTORAD 1335000 and MOTORAD 1263189.

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

One part is listed for the 2021 Cadillac CT4 — GM GENUINE 12690766.

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 2021 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

3 Water Pump parts for the 2021 Cadillac CT4 come from 2 brands — GM GENUINE and STANDARD MOTOR PRODUCTS.

Listed part numbers: GM GENUINE 12738954, GM GENUINE 12746198 and STANDARD MOTOR PRODUCTS EWP105.

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

One part is listed for the 2021 Cadillac CT4 — ACDELCO 2512075.

This table covers the Water Pump housings. Read more

3 Water Pump Housing parts are listed for the 2021 Cadillac CT4, from ACDELCO and GM GENUINE.

Listed part numbers: 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 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 12668035.