2021 GMC Sierra 1500 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 for the 2021 GMC Sierra 1500 come from 6 brands — PRESTONE, PEAK, VALVOLINE and 3 other brands. The "Popular" part is FVP MV5050GAL. Every part fits all 5 engine options (2.7L L4 Turbocharged, 3.0L L6 DIESEL Turbocharged, 4.3L V6, 5.3L V8 and 6.2L V8).

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 Heavy Duty grade, PRESTONE supplies 1 part: rated for severe service. A representative part number is PRESTONE AFC12100.

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

4 Coolant Air Bleed Hose / Pipe parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Listed part numbers: GM GENUINE 84545531, GM GENUINE 85044183 and GM GENUINE 85510505, plus the other parts above.

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

15 Coolant Hose / Pipe parts for the 2021 GMC Sierra 1500 come from GM GENUINE. The "Popular" part is GM GENUINE 12708930.

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 GMC Sierra 1500 — GM GENUINE 55496156.

This table covers the Coolant Hose Connector flanges. Read more

2 Coolant Hose Connector / Flange parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 12693960 and GM GENUINE 1510595.

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

4 Coolant Hose Retainer / Clip parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 11549232, GM GENUINE 11547355 and GM GENUINE 11548672, among others listed above.

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

9 Coolant Reservoir parts are listed for the 2021 GMC Sierra 1500, from TECHPRO, GM GENUINE, DORMAN and 2 other brands.

This group includes DORMAN 603149, GM GENUINE 84632822 and GM GENUINE 84645616 and the remaining 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

7 Coolant Reservoir Cap parts are listed for the 2021 GMC Sierra 1500, from MOTORAD, DORMAN, SKP and 3 other brands. DORMAN 54218 carries the "Popular" badge. 5 parts fit every engine; the other 2 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

2 Cooling System Tester Adapter parts for the 2021 GMC Sierra 1500 come from MOTORAD.

Listed part numbers: MOTORAD 3128 and MOTORAD 3127.

This table covers the Hose clamps. Read more

9 Hose Clamp parts for the 2021 GMC Sierra 1500 come from GM GENUINE. The "Popular" part is GM GENUINE 90530642. 4 parts fit every engine; the other 5 are engine-specific.

Listed part numbers: GM GENUINE 90530642, GM GENUINE 11570871 and GM GENUINE 90572594, plus the other parts above.

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

5 Intercooler parts for the 2021 GMC Sierra 1500 come from 4 brands — GM GENUINE, TECHPRO, GPD and 1 other brand.

The Economy section: 1 option from TECHPRO. TECHPRO GM3012126 is listed in this group.

Standard Replacement: 1 part, from GM GENUINE. A representative part number is GM GENUINE 86285281.

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

Listed part numbers: TECHPRO GM3012126, GM GENUINE 86285281 and GM GENUINE 55512267, plus the other parts above.

This table covers the Intercooler Air Hose pipes. Read more

4 Intercooler Air Hose / Pipe parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

This group includes GM GENUINE 23392843, GM GENUINE 85637389 and GM GENUINE 55515941 and the remaining 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

This group shows a single part: GM GENUINE 40009428.

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

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 11549085.

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

24 Radiator parts for the 2021 GMC Sierra 1500 come from 11 brands — GPD, CSF, GM GENUINE and 8 other brands. The "Popular" part is CSF 3978.

The Economy section: 7 options from GPD and TECHPRO. GPD 13843C is listed in this group.

Standard Replacement: 15 parts, from CSF, GM GENUINE, UAC and 5 other brands. A representative part number is CSF 3978.

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

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 GMC Sierra 1500 come from 3 brands — ACDELCO, GATES and PROFESSIONAL PARTS SWEDEN. 2 parts fit every engine; the other 1 is engine-specific.

This group includes 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 GMC Sierra 1500 — GM GENUINE 22790134.

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

17 Radiator Fan Assembly parts are listed for the 2021 GMC Sierra 1500, from TECHPRO, GM GENUINE, AGILITY and 4 other brands. DORMAN 621806 carries the "Popular" badge.

Economy: 8 parts, from TECHPRO, DORMAN, GPD and 1 other brand. A representative part number is DORMAN 621806.

The Standard Replacement section: 9 options from GM GENUINE, AGILITY and TYC. GM GENUINE 86777555 is listed in this group.

This table covers the Radiator Fan motors. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

This group shows a single part: GM GENUINE 85654566.

This table covers the shrouds that duct air through the fan and radiator. Read more

3 Radiator Fan Shroud parts for the 2021 GMC Sierra 1500 come from GM GENUINE.

Part numbers include GM GENUINE 85112427, GM GENUINE 84203930 and GM GENUINE 84120130.

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

8 Radiator Hose parts are listed for the 2021 GMC Sierra 1500, from ACDELCO and GATES.

Listed part numbers: ACDELCO 85046343, ACDELCO 85067304 and ACDELCO 85046337, plus the other parts above.

This table covers the Radiator Overflow Tube repair kits. Read more

One part is listed for the 2021 GMC Sierra 1500 — GM GENUINE 22799347.

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

28 Temperature Sender / Sensor parts for the 2021 GMC Sierra 1500 come from 8 brands — HOLSTEIN, GM GENUINE, STANDARD MOTOR PRODUCTS and 5 other brands. The "Popular" part is ULTRA-POWER 5S13427. Economy and Standard Replacement are all represented, and Standard Replacement alone accounts for 17 parts.

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

21 Thermostat parts are listed for the 2021 GMC Sierra 1500, from MOTORAD, CALORSTAT, AUTOTECNICA and 7 other brands. ACDELCO 131160 carries the "Popular" badge.

Economy: 3 parts, from AUTOTECNICA, DORMAN and SKP. A representative part number is AUTOTECNICA GM0718523.

The Heavy Duty section: 2 options from MOTORAD. MOTORAD 5523187 is listed in this group.

In the Performance grade, MOTORAD supplies 2 parts: engineered beyond original-equipment specification. A representative part number is MOTORAD 2523160.

The Standard Replacement section: 12 options from MOTORAD, CALORSTAT, ACDELCO and 4 other brands. ACDELCO 131160 is listed in this group.

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

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

8 Thermostat / Thermostat Housing / Water Outlet Seal parts for the 2021 GMC Sierra 1500 come from 5 brands — GM GENUINE, FEL-PRO, APEX and 2 other brands. The "Popular" part is FEL-PRO 36106.

This group includes FEL-PRO 36106, APEX AWO2386 and FEL-PRO 36219 and the remaining parts above.

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

6 Thermostat Housing / Water Outlet parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE, DORMAN, FOUR SEASONS and 2 other brands.

Economy: 1 part, from DORMAN. A representative part number is DORMAN 9022081.

The Standard Replacement section: 3 options from FOUR SEASONS, GATES and MOTORAD. FOUR SEASONS 85945 is listed in this group.

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

Listed part numbers: DORMAN 9022081, FOUR SEASONS 85945 and GATES CO34829, plus the other parts above.

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

This group shows a single part: GM GENUINE 12587397.

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

14 Water Pump parts are listed for the 2021 GMC Sierra 1500, from GM GENUINE, FVP, SKP and 4 other brands. GM GENUINE 13551859 carries the "Popular" badge.

Economy: 4 parts, from FVP, SKP and US MOTOR WORKS. A representative part number is FVP US8206TS.

The Standard Replacement section: 3 options from GM GENUINE and GATES. GM GENUINE 13551859 is listed in this group.