2019 Kia Optima 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

16 Coolant / Antifreeze parts are listed for the 2019 Kia Optima, from PRESTONE, PEAK, VALVOLINE and 3 other brands. FVP MV5050GAL carries the "Popular" badge. 14 parts fit every engine; the other 2 are engine-specific.

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, FVP, PRESTONE and PEAK supply 3 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Premium section lists 5 options from PRESTONE and PEAK — a step above OE specification in materials, tolerances or warranty terms. PRESTONE AF2100 is listed in this group.

The Standard Replacement section lists 7 options from VALVOLINE, BECK/ARNLEY, AISIN and 1 other brand — built to original-equipment specification. VALVOLINE 861398 is listed in this group.

This table covers the Coolant Hose Connector flanges. Read more

2 Coolant Hose Connector / Flange parts are listed for the 2019 Kia Optima, from AUTOTECNICA and FOUR SEASONS.

Listed part numbers: AUTOTECNICA HY0718764 and FOUR SEASONS 86362.

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: MAHLE / CLEVITE C32833.

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 2019 Kia Optima come from MOTORAD. 2 parts fit every engine; the other 2 are engine-specific.

In the Locking Replacement grade, MOTORAD supplies 1 part: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is MOTORAD ST16R.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD T16R.

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

Part numbers include MOTORAD ST16R, MOTORAD T16R and MOTORAD T154, among others listed above.

This table covers the Cooling Fan control modules. Read more

This group shows a single part: GATES FCM176.

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

3 Cooling System Tester Adapter parts are listed for the 2019 Kia Optima, from MOTORAD and GATES. 2 parts fit every engine; the other 1 is engine-specific.

Listed part numbers: GATES 31428, MOTORAD 3121 and MOTORAD 3122.

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

7 Intercooler parts are listed for the 2019 Kia Optima, from TECHPRO, GPD and TYC.

This group includes GPD 2711398, GPD 2711399 and TECHPRO KI3012104 and the remaining parts above.

This table covers the Inverter coolers. Typical signs include overheated fluid, a leak at the fittings, or mixed fluids in the reservoir. Flush the lines when you replace a cooler. Read more

This group shows a single part: TYC 13831.

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

28 Radiator parts are listed for the 2019 Kia Optima, from KOYORAD, CSF, TYC and 9 other brands. CSF 3885 carries the "Popular" badge. Grades run from Economy through Standard Replacement; Standard Replacement is the most populated section, led by KOYORAD, CSF, UAC and 5 other brands.

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 are listed for the 2019 Kia Optima, from GATES, MOTORAD, CALORSTAT and 1 other brand. GATES 31534 carries the "Popular" badge. 5 parts fit every engine; the other 1 is engine-specific.

The Locking Replacement section: 2 options from GATES and MOTORAD. GATES 31534 is listed in this group.

The Standard Replacement section: 4 options from MOTORAD, CALORSTAT, DORMAN and 1 other brand. MOTORAD T16R is listed in this group.

Part numbers include GATES 31534, MOTORAD ST16R and MOTORAD T16R, among others listed above.

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

22 Radiator Fan Assembly parts for the 2019 Kia Optima come from 13 brands — TECHPRO, UAC, DORMAN and 10 other brands. The "Popular" part is DORMAN 621573.

The Economy section: 10 options from TECHPRO, DORMAN, GPD and 3 other brands. DORMAN 621573 is listed in this group.

Standard Replacement: 11 parts, from UAC, TYC, AGILITY and 3 other brands. A representative part number is TYC 623750.

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

This table covers the Radiator Fan blades. Typical signs include chatter, streaks, or a skip at the top of the stroke. Confirm left and right lengths in the notes — they are often different. Read more

This group shows a single part: HYUNDAI 252313R000.

This table covers the Radiator Fan resistors. Read more

2 Radiator Fan Resistor parts are listed for the 2019 Kia Optima, from AUTOTECNICA and STANDARD MOTOR PRODUCTS. All of them fit every engine offered in the 2019 Optima.

This group includes AUTOTECNICA KI0719959 and STANDARD MOTOR PRODUCTS RY2048.

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

6 Radiator Hose parts for the 2019 Kia Optima come from 4 brands — GATES, CONTINENTAL, DAYCO and 1 other brand. The "Popular" part is GATES 24949.

This group includes GATES 24949, CONTINENTAL 66691 and DAYCO 72893 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

20 Temperature Sender / Sensor parts are listed for the 2019 Kia Optima, from STANDARD MOTOR PRODUCTS, HOLSTEIN, GPD and 9 other brands. HOLSTEIN 2CTS0091 carries the "Popular" badge. 2 parts fit every engine; the other 18 are engine-specific.

Economy: 6 parts, from HOLSTEIN, GPD, STANDARD MOTOR PRODUCTS and 1 other brand. A representative part number is HOLSTEIN 2CTS0091.

The Standard Replacement section: 14 options from DELPHI, STANDARD MOTOR PRODUCTS, NTK and 6 other brands. BECK/ARNLEY 1581695 is listed in this group.

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

20 Thermostat parts for the 2019 Kia Optima come from 8 brands — MOTORAD, BECK/ARNLEY, AISIN and 5 other brands. The "Popular" part is AISIN THYK805.

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

17 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2019 Kia Optima, from FEL-PRO, APEX, ELRING and 3 other brands. FEL-PRO 36004 carries the "Popular" badge.

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

18 Thermostat Housing / Water Outlet parts for the 2019 Kia Optima come from 5 brands — MOTORAD, GATES, FOUR SEASONS and 2 other brands. The "Popular" part is FOUR SEASONS 86277.

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 are listed for the 2019 Kia Optima, from AJUSA, APEX and FEL-PRO.

This group includes AJUSA 01113800, APEX AWO2093 and FEL-PRO 35368.

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

22 Water Pump parts for the 2019 Kia Optima come from 10 brands — AISIN, DAYCO, GATES and 7 other brands. The "Popular" part is US MOTOR WORKS US6247.

The Economy section: 8 options from US MOTOR WORKS, BECK/ARNLEY, FVP and 1 other brand. US MOTOR WORKS US6247 is listed in this group.

Standard Replacement: 11 parts, from AISIN, DAYCO, GATES and 2 other brands. A representative part number is AISIN WPK810.

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

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

13 Water Pump Gasket parts are listed for the 2019 Kia Optima, from ELRING, FEL-PRO, APEX and 3 other brands. FEL-PRO 35813 carries the "Popular" badge.

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

2 Water Pump Seal / O-Ring parts for the 2019 Kia Optima come from 2 brands — APEX and FEL-PRO.

This group includes APEX AWP3203 and FEL-PRO ES72872.