2020 Chevrolet Blazer 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 2020 Chevrolet Blazer come from 6 brands — PRESTONE, PEAK, VALVOLINE and 3 other brands. The "Popular" part is FVP MV5050GAL.

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

3 Coolant Air Bleed Hose / Pipe parts for the 2020 Chevrolet Blazer come from GM GENUINE.

Listed part numbers: GM GENUINE 12683454, GM GENUINE 12653191 and GM GENUINE 12717142.

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

7 Coolant Hose / Pipe parts for the 2020 Chevrolet Blazer come from GM GENUINE.

Part numbers include GM GENUINE 84097808, GM GENUINE 12627054 and GM GENUINE 84006787, 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

2 Coolant Hose / Pipe Seal parts are listed for the 2020 Chevrolet Blazer, from FEL-PRO and GM GENUINE.

Listed part numbers: FEL-PRO 36156 and GM GENUINE 12627055.

This table covers the Coolant Hose Connector flanges. Read more

This group shows a single part: GM GENUINE 23333192.

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 2020 Chevrolet Blazer — ELRING 237180.

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

This group shows a single part: GM GENUINE 15041309.

This table covers the gaskets that seal the Coolant Pipe. 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 2020 Chevrolet Blazer — ELRING 237170.

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

7 Coolant Reservoir parts are listed for the 2020 Chevrolet Blazer, from TECHPRO, DORMAN, GM GENUINE and 3 other brands. DORMAN 603861 carries the "Popular" badge.

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

6 Coolant Reservoir Cap parts are listed for the 2020 Chevrolet Blazer, from DORMAN, SKP, AUTOTECNICA and 3 other brands. DORMAN 54218 carries the "Popular" badge.

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 2020 Chevrolet Blazer come from MOTORAD.

This group includes MOTORAD 3128 and MOTORAD 3127.

This table covers the Hose clamps. Read more

7 Hose Clamp parts for the 2020 Chevrolet Blazer come from GM GENUINE. The "Popular" part is GM GENUINE 90572589.

Part numbers include GM GENUINE 90572589, GM GENUINE 90572595 and GM GENUINE 11547681, among others listed above.

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 for the 2020 Chevrolet Blazer come from 7 brands — GM GENUINE, TYC, AGILITY and 4 other brands. The "Popular" part is GM GENUINE 85797937.

This group includes GM GENUINE 85797937, TYC 13613 and AGILITY 8013613 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 for the 2020 Chevrolet Blazer come from 2 brands — ACDELCO and PROFESSIONAL PARTS SWEDEN.

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

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

One part is listed for the 2020 Chevrolet Blazer — GM GENUINE 23444086.

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

9 Radiator Fan Assembly parts are listed for the 2020 Chevrolet Blazer, from GM GENUINE, GPD, VARIOUS MFR and 3 other brands. FOUR SEASONS 75197 carries the "Popular" badge.

Economy: 3 parts, from GPD and VARIOUS MFR. A representative part number is GPD 2811643.

The Standard Replacement section: 6 options from GM GENUINE, FOUR SEASONS, TYC and 1 other brand. FOUR SEASONS 75197 is listed in this group.

This group includes FOUR SEASONS 75197, GPD 2811643 and GPD 2812298 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

11 Radiator Hose parts are listed for the 2020 Chevrolet Blazer, from ACDELCO, GM GENUINE, CONTINENTAL and 1 other brand. ACDELCO 23253702 carries the "Popular" badge.

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

GM GENUINE supplies both parts for the 2020 Chevrolet Blazer.

Listed part numbers: GM GENUINE 23100851 and GM GENUINE 23100852.

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 for the 2020 Chevrolet Blazer come from 6 brands — GM GENUINE, GPD, FACET and 3 other brands. The "Popular" part is GM GENUINE 55488246.

The Economy section: 1 option from GPD. GPD 1712908 is listed in this group.

Standard Replacement: 6 parts, from GM GENUINE, FACET, STANDARD MOTOR PRODUCTS and 2 other brands. A representative part number is GM GENUINE 55488246.

Part numbers include GM GENUINE 55488246, GPD 1712908 and GM GENUINE 12650595, among others listed above.

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

This group shows a single part: DORMAN 66264.

This table covers the Temperature Sender / Sensor 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 12639042.

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

4 Thermostat parts are listed for the 2020 Chevrolet Blazer, from MOTORAD and FOUR SEASONS.

The Heavy Duty section: 1 option from MOTORAD. MOTORAD 5860203 is listed in this group.

The Standard Replacement section: 3 options from MOTORAD and FOUR SEASONS. FOUR SEASONS 86343 is listed in this group.

Part numbers include MOTORAD 5860203, FOUR SEASONS 86343 and MOTORAD 860203, among others listed 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 for the 2020 Chevrolet Blazer come from 4 brands — GM GENUINE, ELRING, FEL-PRO and 1 other brand. The "Popular" part is GM GENUINE 12623519.

Part numbers include GM GENUINE 12623519, ELRING 048290 and FEL-PRO 36165, among others listed above.

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

2 Thermostat Housing / Water Outlet parts are listed for the 2020 Chevrolet Blazer, from GATES and GM GENUINE.

This group includes GATES CO35087 and GM GENUINE 12741009.

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

3 Water Inlet Gasket parts for the 2020 Chevrolet Blazer come from 3 brands — FEL-PRO, GM GENUINE and MAHLE / CLEVITE.

Listed part numbers: FEL-PRO 36167, GM GENUINE 12647400 and MAHLE / CLEVITE C33508.

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

7 Water Pump parts are listed for the 2020 Chevrolet Blazer, from FVP, US MOTOR WORKS, ACDELCO and 4 other brands. ACDELCO 2521038 carries the "Popular" badge.

Economy: 2 parts, from FVP and US MOTOR WORKS. A representative part number is FVP US8148.

The Standard Replacement section: 4 options from ACDELCO, GM GENUINE, FOUR SEASONS and 1 other brand. ACDELCO 2521038 is listed in this group.

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

Listed part numbers: ACDELCO 2521038 and FVP US8148, plus the other 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

5 Water Pump Gasket parts for the 2020 Chevrolet Blazer come from 3 brands — ELRING, GM GENUINE and FEL-PRO. The "Popular" part is GM GENUINE 2512072.

This group includes GM GENUINE 2512072, ELRING 048370 and ELRING 048320 and the remaining parts above.

This table covers the Water Pump Inlet tubes. Read more

One part is listed for the 2020 Chevrolet Blazer — GM GENUINE 12706857.

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

This group shows a single part: GM GENUINE 12652047.

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

4 Water Pump Seal / O-Ring parts are listed for the 2020 Chevrolet Blazer, from GM GENUINE and ELRING.

Part numbers include ELRING 048350, GM GENUINE 12646951 and GM GENUINE 12646952, among others listed above.