2021 GMC Terrain 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

17 Coolant / Antifreeze parts are listed for the 2021 GMC Terrain, from PRESTONE, VALVOLINE, PEAK and 3 other brands. FVP MV5050GAL carries the "Popular" badge. 6 parts fit every engine; the other 11 are engine-specific.

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, VALVOLINE, PEAK and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Heavy Duty section lists 1 option from PRESTONE — rated for severe service. PRESTONE AFC12100 is listed in this group.

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 both parts for the 2021 GMC Terrain. All of them fit every engine offered in the 2021 Terrain.

Listed part numbers: GM GENUINE 12650443 and GM GENUINE 84914036.

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

3 Coolant Hose / Pipe parts are listed for the 2021 GMC Terrain, from GM GENUINE and GATES. 2 parts fit every engine; the other 1 is engine-specific.

This group includes GATES 12509, GM GENUINE 12649871 and GM GENUINE 12667458.

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

6 Coolant Hose / Pipe Seal parts for the 2021 GMC Terrain come from 3 brands — GM GENUINE, FEL-PRO and MAHLE / CLEVITE. The "Popular" part is GM GENUINE 12635750. 4 parts fit every engine; the other 2 are engine-specific.

Part numbers include GM GENUINE 12635750, GM GENUINE 12662185 and FEL-PRO 36247, among others listed above.

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

One part is listed for the 2021 GMC Terrain — GM GENUINE 11548868.

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

7 Coolant Reservoir parts for the 2021 GMC Terrain come from 6 brands — TECHPRO, DORMAN, GM GENUINE and 3 other brands. The "Popular" part is DORMAN 603861. 6 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: DORMAN 603861, GM GENUINE 23386455 and GPD 2411160, plus the other parts above.

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 GMC Terrain come from 6 brands — DORMAN, SKP, AUTOTECNICA and 3 other brands. The "Popular" part is DORMAN 54218. 3 parts fit every engine; the other 3 are engine-specific.

Listed part numbers: DORMAN 54218, SKP SK54218 and AUTOTECNICA GM0714619, plus the other parts above.

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

MOTORAD supplies both parts for the 2021 GMC Terrain.

Part numbers include MOTORAD 3128 and MOTORAD 3127.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 5 Hose Clamp parts for the 2021 GMC Terrain. GM GENUINE 90530642 carries the "Popular" badge. All of them fit every engine offered in the 2021 Terrain.

This group includes GM GENUINE 90530642, GM GENUINE 90572594 and GM GENUINE 11570614 and the remaining parts above.

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

9 Intercooler parts are listed for the 2021 GMC Terrain, from GM GENUINE, TYC, SPECTRA PREMIUM and 3 other brands. TYC 18103 carries the "Popular" badge.

Economy: 1 part, from TECHPRO. A representative part number is TECHPRO GM3012117.

The Standard Replacement section: 1 option from GM GENUINE. GM GENUINE 85046823 is listed in this group.

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

Listed part numbers: TYC 18103, TECHPRO GM3012117 and GM GENUINE 85046823, plus the other parts above.

This table covers the Intercooler Air Hose pipes. Read more

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

Listed part numbers: GM GENUINE 84836352 and GM GENUINE 84498032.

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 are listed for the 2021 GMC Terrain, from CSF, TYC, AGILITY and 5 other brands. CSF 3866 carries the "Popular" badge. 7 parts fit every engine; the other 1 is engine-specific.

This group includes CSF 3866, TYC 13682 and AGILITY 8013691 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

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

This group includes ACDELCO RC124 and PROFESSIONAL PARTS SWEDEN 21342353.

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

2 Radiator Drain Petcock parts for the 2021 GMC Terrain come from 2 brands — ACDELCO and DORMAN. 1 part fits every engine; the other 1 is engine-specific.

This group includes ACDELCO 22985584 and DORMAN 61134.

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

11 Radiator Fan Assembly parts for the 2021 GMC Terrain come from 10 brands — TECHPRO, DORMAN, GPD and 7 other brands. The "Popular" part is GM GENUINE 84847895. 3 parts fit every engine; the other 8 are engine-specific.

The Economy section: 5 options from TECHPRO, DORMAN, GPD and 1 other brand. DORMAN 621985 is listed in this group.

Standard Replacement: 5 parts, from GM GENUINE, TYC, AGILITY and 2 other brands. A representative part number is GM GENUINE 84847895.

1 further part sits outside the graded sections, with the same engine-level match.

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

6 Radiator Hose parts for the 2021 GMC Terrain come from 3 brands — ACDELCO, GATES and CONTINENTAL. The "Popular" part is ACDELCO 84914035. 2 parts fit every engine; the other 4 are engine-specific.

Listed part numbers: ACDELCO 84914035, GATES 51802 and ACDELCO 84914034, plus the other parts above.

This table covers the Radiator Insulator sleeves. Read more

This group shows a single part: GM GENUINE 23134225.

This table covers the seals at the Radiator. 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

3 Radiator Seal parts for the 2021 GMC Terrain come from GM GENUINE.

Part numbers include GM GENUINE 23270572, GM GENUINE 85607646 and GM GENUINE 85607647.

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

7 Temperature Sender / Sensor parts are listed for the 2021 GMC Terrain, from STANDARD MOTOR PRODUCTS, HOLSTEIN, UNITED MOTOR PRODUCTS and 3 other brands. GM GENUINE 12641073 carries the "Popular" badge.

Economy: 3 parts, from HOLSTEIN, STANDARD MOTOR PRODUCTS and UNITED MOTOR PRODUCTS. A representative part number is HOLSTEIN 2CTS0125.

The Standard Replacement section: 4 options from GM GENUINE, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 1 other brand. GM GENUINE 12641073 is listed in this group.

Part numbers include GM GENUINE 12641073, HOLSTEIN 2CTS0125 and STANDARD MOTOR PRODUCTS TX229T, among others listed above.

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

One part is listed for the 2021 GMC Terrain — 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

6 Thermostat parts for the 2021 GMC Terrain come from 6 brands — AUTOTECNICA, DORMAN, SKP and 3 other brands. The "Popular" part is GATES 34842.

The Economy section: 3 options from AUTOTECNICA, DORMAN and SKP. AUTOTECNICA GM0720227 is listed in this group.

Standard Replacement: 3 parts, from GATES, MOTORAD and FOUR SEASONS. A representative part number is GATES 34842.

Listed part numbers: GATES 34842, AUTOTECNICA GM0720227 and DORMAN 9022124, plus the other 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

5 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2021 GMC Terrain, from GM GENUINE, FEL-PRO, MAHLE / CLEVITE and 1 other brand. GM GENUINE 12649163 carries the "Popular" badge.

Listed part numbers: GM GENUINE 12649163, FEL-PRO 36208 and GM GENUINE 12664202, plus the other parts above.

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

7 Thermostat Housing / Water Outlet parts for the 2021 GMC Terrain come from 6 brands — GM GENUINE, DORMAN, SKP and 3 other brands. The "Popular" part is DORMAN 9022132.

The Economy section: 2 options from DORMAN and SKP. DORMAN 9022132 is listed in this group.

Standard Replacement: 5 parts, from GM GENUINE, FOUR SEASONS, GATES and 1 other brand. A representative part number is GM GENUINE 12707589.

Part numbers include DORMAN 9022132, SKP SK9022132 and GM GENUINE 12707589, among others listed above.

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 for the 2021 GMC Terrain come from 8 brands — GM GENUINE, GMB, FVP and 5 other brands. The "Popular" part is GM GENUINE 251814.

The Economy section: 4 options from FVP, SKP, US MOTOR WORKS and 1 other brand. FVP US8147 is listed in this group.

Standard Replacement: 7 parts, from GM GENUINE, GMB, DAYCO and 1 other brand. A representative part number is GM GENUINE 251814.

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

6 Water Pump Gasket parts are listed for the 2021 GMC Terrain, from GM GENUINE, FEL-PRO and MAHLE / CLEVITE. GM GENUINE 2512070 carries the "Popular" badge.

Listed part numbers: GM GENUINE 2512070, GM GENUINE 2512067 and FEL-PRO 36209, plus the other parts above.

This table covers the Water Pump housings. Read more

2 Water Pump Housing parts are listed for the 2021 GMC Terrain, from ACDELCO and GM GENUINE.

This group includes ACDELCO 12708796 and GM GENUINE 25204308.

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 2021 GMC Terrain — GM GENUINE 12642753.