2021 Kia Rio 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

15 Coolant / Antifreeze parts for the 2021 Kia Rio come from 7 brands — PRESTONE, PEAK, VALVOLINE and 4 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 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, BECK/ARNLEY, VALVOLINE, AISIN and 2 other brands supply 6 parts: built to original-equipment specification. A representative part number is VALVOLINE 861398.

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

2 Cooling System Tester Adapter parts for the 2021 Kia Rio come from 2 brands — GATES and MOTORAD.

Listed part numbers: GATES 31428 and MOTORAD 3121.

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

7 Radiator parts for the 2021 Kia Rio come from 7 brands — GPD, CSF, HYUNDAI and 4 other brands. The "Popular" part is CSF 3914.

The Economy section: 1 option from GPD. GPD 13817C is listed in this group.

Standard Replacement: 6 parts, from CSF, HYUNDAI, AGILITY and 3 other brands. A representative part number is CSF 3914.

Part numbers include CSF 3914, GPD 13817C and HYUNDAI 25310H9000, 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

6 Radiator Cap parts for the 2021 Kia Rio come from 4 brands — GATES, MOTORAD, CALORSTAT and 1 other brand. The "Popular" part is GATES 31534.

In the Locking Replacement grade, GATES and MOTORAD supply 2 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is GATES 31534.

Standard Replacement: 4 parts, from MOTORAD, CALORSTAT, DORMAN and 1 other brand. A representative part number is MOTORAD T16R.

Listed part numbers: GATES 31534, MOTORAD ST16R and MOTORAD T16R, plus the other parts above.

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

6 Radiator Fan Assembly parts are listed for the 2021 Kia Rio, from GPD, VARIOUS MFR, AGILITY and 3 other brands. AGILITY 6010342 carries the "Popular" badge.

Economy: 2 parts, from GPD and VARIOUS MFR. A representative part number is GPD 2812052.

The Standard Replacement section: 4 options from AGILITY, TYC, FOUR SEASONS and 1 other brand. AGILITY 6010342 is listed in this group.

Listed part numbers: AGILITY 6010342, GPD 2812052 and VARIOUS MFR HY3115161, plus the other parts above.

This table covers the Radiator Fan resistors. Read more

This group shows a single part: STANDARD MOTOR PRODUCTS RY2027.

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

4 Radiator Hose parts are listed for the 2021 Kia Rio, from CONTINENTAL and GATES.

This group includes CONTINENTAL 61606, CONTINENTAL 66991 and GATES 52180 and the remaining parts above.

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 for the 2021 Kia Rio come from 7 brands — STANDARD MOTOR PRODUCTS, GPD, WELLS and 4 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS TX122T.

The Economy section: 4 options from GPD, STANDARD MOTOR PRODUCTS and UNITED MOTOR PRODUCTS. STANDARD MOTOR PRODUCTS TX122T is listed in this group.

Standard Replacement: 7 parts, from STANDARD MOTOR PRODUCTS, WELLS, WALKER PRODUCTS and 1 other brand. A representative part number is STANDARD MOTOR PRODUCTS TX122.

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

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

5 Thermostat parts are listed for the 2021 Kia Rio, from MOTORAD, AUTOTECNICA, SKP and 1 other brand. MOTORAD 726180 carries the "Popular" badge.

Economy: 2 parts, from AUTOTECNICA and SKP. A representative part number is AUTOTECNICA HY0720684.

The Standard Replacement section: 3 options from MOTORAD and FOUR SEASONS. MOTORAD 726180 is listed in this group.

Listed part numbers: MOTORAD 726180, AUTOTECNICA HY0720684 and SKP SK86358, 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

This group shows a single part: ELRING 326310.

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

8 Water Pump parts are listed for the 2021 Kia Rio, from FVP, US MOTOR WORKS, DAYCO and 2 other brands. US MOTOR WORKS US6247 carries the "Popular" badge.

Economy: 2 parts, from US MOTOR WORKS and FVP. A representative part number is US MOTOR WORKS US6247.

The Standard Replacement section: 3 options from DAYCO, GATES and GMB. DAYCO DP1936 is listed in this group.

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

Part numbers include US MOTOR WORKS US6247 and DAYCO DP1936, among others listed above.