2021 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

16 Coolant / Antifreeze parts for the 2021 Cadillac CT5 come from 6 brands — PRESTONE, PEAK, VALVOLINE and 3 other brands. The "Popular" part is FVP MV5050GAL. Every part fits both the 2.0L L4 Turbocharged and the 3.0L V6 Turbocharged.

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 4 options from FVP, PEAK, PRESTONE and 1 other brand — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

In the Premium grade, PRESTONE and PEAK supply 4 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, ACDELCO and 2 other brands supply 7 parts: built to original-equipment specification. A representative part number is ACDELCO 105027.

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

6 Coolant Air Bleed Hose / Pipe parts for the 2021 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

7 Coolant Hose / Pipe parts for the 2021 Cadillac CT5 come from 2 brands — GM GENUINE and ACDELCO. The "Popular" part is ACDELCO 55515456. 1 part fits every engine; the other 6 are engine-specific.

Part numbers include ACDELCO 55515456, ACDELCO 84873589 and GM GENUINE 55487348, 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

One part is listed for the 2021 Cadillac CT5 — GM GENUINE 12659280.

This table covers the Coolant Hose Connector flanges. Read more

3 Coolant Hose Connector / Flange parts for the 2021 Cadillac CT5 come from 2 brands — GM GENUINE and FOUR SEASONS.

Listed part numbers: FOUR SEASONS 86373, GM GENUINE 23333192 and GM GENUINE 23171715.

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 2021 Cadillac CT5 — ELRING 237180.

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

4 Coolant Hose Retainer / Clip parts for the 2021 Cadillac CT5 come from GM GENUINE. 2 parts fit every engine; the other 2 are engine-specific.

This group includes GM GENUINE 11548857, GM GENUINE 11547354 and GM GENUINE 88996648 and the remaining parts above.

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

One part is listed for the 2021 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 2021 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

6 Coolant Reservoir Cap parts are listed for the 2021 Cadillac CT5, from DORMAN, AUTOTECNICA, CALORSTAT and 3 other brands. DORMAN 54218 carries the "Popular" badge. 3 parts fit every engine; the other 3 are engine-specific.

Listed part numbers: DORMAN 54218, AUTOTECNICA GM0714619 and CALORSTAT RC0144, plus the other parts above.

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

13 Hose Clamp parts for the 2021 Cadillac CT5 come from GM GENUINE. The "Popular" part is GM GENUINE 11570871. 4 parts fit every engine; the other 9 are engine-specific.

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

4 Intercooler parts for the 2021 Cadillac CT5 come from GM GENUINE.

Part numbers include GM GENUINE 84750051, GM GENUINE 84577608 and GM GENUINE 12699267, among others listed above.

This table covers the Intercooler Air Hose pipes. Read more

3 Intercooler Air Hose / Pipe parts for the 2021 Cadillac CT5 come from GM GENUINE.

This group includes GM GENUINE 84009657, GM GENUINE 12672331 and GM GENUINE 12672333.

This table covers the Intercooler covers. Read more

One part is listed for the 2021 Cadillac CT5 — GM GENUINE 12729230.

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 both parts for the 2021 Cadillac CT5. 1 part fits every engine; the other 1 is engine-specific.

Part numbers include GM GENUINE 12652017 and GM GENUINE 12652026.

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

This group shows a single part: GM GENUINE 84849419.

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

GM GENUINE supplies both parts for the 2021 Cadillac CT5.

Part numbers include GM GENUINE 13438980 and GM GENUINE 12661079.

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

11 Radiator parts for the 2021 Cadillac CT5 come from 6 brands — GM GENUINE, GPD, TECHPRO and 3 other brands. The "Popular" part is GM GENUINE 84511252.

The Economy section: 4 options from GPD and TECHPRO. GPD 13889C is listed in this group.

Standard Replacement: 7 parts, from GM GENUINE, FVP, KOYORAD and 1 other brand. A representative part number is GM GENUINE 84511252.

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 for the 2021 Cadillac CT5 come from 3 brands — ACDELCO, GATES and PROFESSIONAL PARTS SWEDEN. 2 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: ACDELCO RC124, GATES 31569 and PROFESSIONAL PARTS SWEDEN 21342353.

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

One part is listed for the 2021 Cadillac CT5 — 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 are listed for the 2021 Cadillac CT5, from TECHPRO and GM GENUINE. All of them fit every engine offered in the 2021 CT5.

Economy: 1 part, from TECHPRO. A representative part number is TECHPRO GM3115355.

The Standard Replacement section: 1 option from GM GENUINE. GM GENUINE 85080140 is listed in this group.

Part numbers include 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

One part is listed for the 2021 Cadillac CT5 — ACDELCO 84805594.

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

11 Temperature Sender / Sensor parts for the 2021 Cadillac CT5 come from 7 brands — GM GENUINE, HOLSTEIN, STANDARD MOTOR PRODUCTS and 4 other brands. The "Popular" part is GM GENUINE 55488246.

The Economy section: 3 options from HOLSTEIN and GPD. GPD 1814558 is listed in this group.

Standard Replacement: 8 parts, from GM GENUINE, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 2 other brands. A representative part number is GM GENUINE 55488246.

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

This group shows a single part: 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

One part is listed for the 2021 Cadillac CT5 — MOTORAD 1335000.

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

2 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2021 Cadillac CT5 come from 2 brands — FEL-PRO and GM GENUINE.

Part numbers include FEL-PRO 36164 and 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

2 Water Inlet Gasket parts for the 2021 Cadillac CT5 come from GM GENUINE.

Part numbers include GM GENUINE 55504553 and GM GENUINE 12647400.