2021 Chevrolet Trailblazer 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

13 Coolant / Antifreeze parts are listed for the 2021 Chevrolet Trailblazer, from PEAK, VALVOLINE, PRESTONE and 3 other brands. FVP MV5050GAL carries the "Popular" badge.

In the Economy grade, FVP, PEAK and VALVOLINE supply 3 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 2 options from PEAK — a step above OE specification in materials, tolerances or warranty terms. PEAK PKP1GAL 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

One part is listed for the 2021 Chevrolet Trailblazer — GM GENUINE 42869226.

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

4 Coolant Hose / Pipe parts are listed for the 2021 Chevrolet Trailblazer, from GM GENUINE and ACDELCO.

Listed part numbers: ACDELCO 42744650, GM GENUINE 12673762 and GM GENUINE 42755860, plus the other parts 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 for the 2021 Chevrolet Trailblazer come from 2 brands — ELRING and GM GENUINE.

Part numbers include ELRING 112770 and GM GENUINE 12666900.

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

GM GENUINE supplies both parts for the 2021 Chevrolet Trailblazer.

Part numbers include GM GENUINE 42732057 and GM GENUINE 42755861.

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

This group shows a single part: ELRING 112820.

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

This group shows a single part: GM GENUINE 13545831.

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

4 Coolant Reservoir Cap parts for the 2021 Chevrolet Trailblazer come from 4 brands — AUTOTECNICA, CALORSTAT, GATES and 1 other brand.

Part numbers include AUTOTECNICA GM0714619, CALORSTAT RC0144 and GATES 31569, among others listed above.

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

MOTORAD supplies both parts for the 2021 Chevrolet Trailblazer.

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 Chevrolet Trailblazer. GM GENUINE 13162312 carries the "Popular" badge.

Part numbers include GM GENUINE 13162312, GM GENUINE 90572594 and GM GENUINE 11547681, among others listed above.

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

4 Intercooler parts are listed for the 2021 Chevrolet Trailblazer, from TECHPRO, GM GENUINE, GPD and 1 other brand.

Economy: 1 part, from TECHPRO. A representative part number is TECHPRO GM3012127.

The Standard Replacement section: 1 option from GM GENUINE. GM GENUINE 42805212 is listed in this group.

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

Part numbers include TECHPRO GM3012127, GM GENUINE 42805212 and GPD 2711567, among others listed above.

This table covers the Intercooler Air Hose pipes. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Trailblazer.

Listed part numbers: GM GENUINE 60009092 and GM GENUINE 60009112.

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

This group shows a single part: GM GENUINE 42651298.

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 2021 Chevrolet Trailblazer, from GPD, CSF, GM GENUINE and 2 other brands. CSF 3955 carries the "Popular" badge.

Economy: 1 part, from GPD. A representative part number is GPD 13909C.

The Standard Replacement section: 4 options from CSF, GM GENUINE, KOYORAD and 1 other brand. CSF 3955 is listed in this group.

Part numbers include CSF 3955, GPD 13909C and GM GENUINE 42771761, among others listed 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 Chevrolet Trailblazer, from ACDELCO and PROFESSIONAL PARTS SWEDEN.

Listed part numbers: ACDELCO 13544913 and PROFESSIONAL PARTS SWEDEN 21342353.

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

This group shows a single part: GM GENUINE 22790134.

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

6 Radiator Fan Assembly parts for the 2021 Chevrolet Trailblazer come from 3 brands — TECHPRO, GM GENUINE and UAC. The "Popular" part is GM GENUINE 60009121.

The Economy section: 2 options from TECHPRO. TECHPRO GM3115336 is listed in this group.

Standard Replacement: 4 parts, from GM GENUINE and UAC. A representative part number is GM GENUINE 60009121.

Listed part numbers: GM GENUINE 60009121, TECHPRO GM3115336 and TECHPRO GM3115361, plus the other 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 2021 Chevrolet Trailblazer come from ACDELCO.

Listed part numbers: ACDELCO 42822117 and ACDELCO 42822959.

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

This group shows a single part: GM GENUINE 42589938.

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

12 Temperature Sender / Sensor parts are listed for the 2021 Chevrolet Trailblazer, from HOLSTEIN, GM GENUINE, STANDARD MOTOR PRODUCTS and 4 other brands. GM GENUINE 55488246 carries the "Popular" badge.

Economy: 4 parts, from HOLSTEIN and GPD. A representative part number is GPD 1814555.

The Standard Replacement section: 8 options from GM GENUINE, STANDARD MOTOR PRODUCTS, WALKER PRODUCTS and 2 other brands. GM GENUINE 55488246 is listed in this group.

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

One part is listed for the 2021 Chevrolet Trailblazer — 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

This group shows a single part: MOTORAD TA9252.

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

One part is listed for the 2021 Chevrolet Trailblazer — ELRING 112710.

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

2 Water Pump parts for the 2021 Chevrolet Trailblazer come from 2 brands — SKP and GM GENUINE.

The Economy section: 1 option from SKP. SKP SK12718625 is listed in this group.

Standard Replacement: 1 part, from GM GENUINE. A representative part number is GM GENUINE 25208565.

Part numbers include SKP SK12718625 and GM GENUINE 25208565.

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

One part is listed for the 2021 Chevrolet Trailblazer — GM GENUINE 2512077.