2025 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

11 Coolant / Antifreeze parts are listed for the 2025 GMC Terrain, from PRESTONE, VALVOLINE and ACDELCO. PRESTONE AF2100 carries the "Popular" badge.

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

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. ACDELCO 105027 is listed in this group.

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

GM GENUINE supplies the 4 Coolant Air Bleed Hose / Pipe parts for the 2025 GMC Terrain.

Listed part numbers: GM GENUINE 12650443, GM GENUINE 26572782 and GM GENUINE 26572783, plus the other parts above.

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

GM GENUINE supplies both parts for the 2025 GMC Terrain.

Part numbers include 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

2 Coolant Hose / Pipe Seal parts for the 2025 GMC Terrain come from GM GENUINE.

Part numbers include GM GENUINE 12635750 and GM GENUINE 12662185.

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

5 Coolant Reservoir parts for the 2025 GMC Terrain come from 4 brands — TECHPRO, DORMAN, GM GENUINE and 1 other brand. The "Popular" part is DORMAN 603861.

Part numbers include DORMAN 603861, GM GENUINE 23386455 and GPD 2411160, among others listed 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

This group shows a single part: GATES 31569.

This table covers the Hose clamps. Read more

GM GENUINE supplies the 5 Hose Clamp parts for the 2025 GMC Terrain. GM GENUINE 90530642 carries the "Popular" badge.

Part numbers include GM GENUINE 90530642, GM GENUINE 90572594 and GM GENUINE 11602210, among others listed above.

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

5 Intercooler parts are listed for the 2025 GMC Terrain, from TYC, DORMAN, GM GENUINE and 2 other brands. TYC 18103 carries the "Popular" badge.

Listed part numbers: TYC 18103, DORMAN 918527 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 2025 GMC Terrain.

Part numbers include GM GENUINE 26531060 and GM GENUINE 26343819.

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 GMC Terrain, from GM GENUINE, CSF, SPECTRA PREMIUM and 1 other brand. CSF 3866 carries the "Popular" badge.

This group includes CSF 3866, GM GENUINE 84989891 and GM GENUINE 84899819 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 GMC Terrain — ACDELCO RC124.

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

This group shows a single part: ACDELCO 22985584.

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

4 Radiator Fan Assembly parts for the 2025 GMC Terrain come from 3 brands — GM GENUINE, ULTRA-POWER and TYC.

The Economy section: 1 option from ULTRA-POWER. ULTRA-POWER 625250 is listed in this group.

Standard Replacement: 3 parts, from GM GENUINE and TYC. A representative part number is GM GENUINE 86285697.

This group includes ULTRA-POWER 625250, GM GENUINE 86285697 and GM GENUINE 85109720 and the remaining parts above.

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

2 Radiator Hose parts for the 2025 GMC Terrain come from CONTINENTAL.

Part numbers include CONTINENTAL 67342 and CONTINENTAL 67340.

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 2025 GMC Terrain come from GM GENUINE.

Listed part numbers: 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

4 Temperature Sender / Sensor parts are listed for the 2025 GMC Terrain, from STANDARD MOTOR PRODUCTS, HOLSTEIN and GM GENUINE.

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

The Standard Replacement section: 2 options from GM GENUINE and STANDARD MOTOR PRODUCTS. GM GENUINE 55489870 is listed in this group.

Part numbers include HOLSTEIN 2CTS0125, STANDARD MOTOR PRODUCTS TX229T and GM GENUINE 55489870, among others listed above.

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 2025 GMC Terrain come from 2 brands — DORMAN and MOTORAD.

The Economy section: 1 option from DORMAN. DORMAN 9022124 is listed in this group.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD 993176.

This group includes DORMAN 9022124 and MOTORAD 993176.

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

GM GENUINE supplies both parts for the 2025 GMC Terrain.

Listed part numbers: GM GENUINE 12664202 and GM GENUINE 12649163.

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

5 Thermostat Housing / Water Outlet parts for the 2025 GMC Terrain come from 4 brands — GM GENUINE, DORMAN, GATES and 1 other brand. The "Popular" part is GM GENUINE 12707589.

The Economy section: 1 option from DORMAN. DORMAN 9022132 is listed in this group.

Standard Replacement: 4 parts, from GM GENUINE, GATES and MOTORAD. A representative part number is GM GENUINE 12707589.

Part numbers include GM GENUINE 12707589, DORMAN 9022132 and GATES CO35004, 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

5 Water Pump parts for the 2025 GMC Terrain come from 5 brands — DAYCO, FVP, GATES and 2 other brands.

This group includes DAYCO DP2255, FVP 1303120 and GATES 42201 and the remaining 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

4 Water Pump Gasket parts are listed for the 2025 GMC Terrain, from FEL-PRO and GM GENUINE.

Listed part numbers: FEL-PRO 36209, FEL-PRO 36207 and GM GENUINE 2512070, plus the other parts above.

This table covers the Water Pump housings. Read more

One part is listed for the 2025 GMC Terrain — 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 2025 GMC Terrain — GM GENUINE 12642753.