2015 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

18 Coolant / Antifreeze parts are listed for the 2015 Kia Optima, from PRESTONE, VALVOLINE, PEAK and 3 other brands. FVP MV5050GAL carries the "Popular" badge. 13 parts fit every engine; the other 5 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, PEAK and 1 other brand supply 4 parts: the catalog's value-priced group. A representative part number is FVP MV5050GAL.

The Heavy Duty section lists 1 option from VALVOLINE — rated for severe service. VALVOLINE ZXG051 is listed in this group.

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

One part is listed for the 2015 Kia Optima — HYUNDAI 254802G820.

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 2015 Kia Optima come from 2 brands — HYUNDAI and VICTOR REINZ. 1 part fits every engine; the other 1 is engine-specific.

Listed part numbers: HYUNDAI 2546221000 and VICTOR REINZ 151118601.

This table covers the Coolant Hose Connector flanges. Read more

One part is listed for the 2015 Kia Optima — ACKOJA A520753.

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

2 Coolant Reservoir parts for the 2015 Kia Optima come from 2 brands — LARES and TECHPRO. 1 part fits every engine; the other 1 is engine-specific.

This group includes LARES 37410 and TECHPRO HY3014110.

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

3 Coolant Reservoir Cap parts for the 2015 Kia Optima come from MOTORAD. 1 part fits 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 ST13R.

Standard Replacement: 1 part, from MOTORAD. A representative part number is MOTORAD T13R.

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

Listed part numbers: MOTORAD ST13R, MOTORAD T13R and MOTORAD T142.

This table covers the Cooling Fan control modules. Read more

5 Cooling Fan Control Module parts for the 2015 Kia Optima come from 3 brands — US MOTOR WORKS, AUTOTECNICA and GATES.

Listed part numbers: AUTOTECNICA KI0721547, GATES FCM145 and US MOTOR WORKS 16749, plus the other parts above.

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

4 Cooling System Tester Adapter parts are listed for the 2015 Kia Optima, from MOTORAD, GATES and STANT. All of them fit every engine offered in the 2015 Optima.

Part numbers include GATES 31428, MOTORAD 3121 and MOTORAD 3122, among others listed above.

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

7 Intercooler parts are listed for the 2015 Kia Optima, from TYC, TECHPRO, CSF and 2 other brands. TYC 18054 carries the "Popular" badge.

Part numbers include TYC 18054, CSF 6047 and GPD 2711354, among others listed 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

9 Inverter Cooler parts for the 2015 Kia Optima come from 8 brands — CSF, DORMAN, DENSO and 5 other brands. The "Popular" part is CSF 3678.

The Economy section: 1 option from DORMAN. DORMAN 918570 is listed in this group.

Standard Replacement: 6 parts, from CSF, DENSO, AGILITY and 3 other brands. A representative part number is CSF 3678.

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

This group includes CSF 3678, DORMAN 918570 and DENSO 2219446 and the remaining parts 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

28 Radiator parts are listed for the 2015 Kia Optima, from CSF, UAC, AGILITY and 11 other brands. CSF 3756 carries the "Popular" badge. Economy and Standard Replacement are all represented, and Standard Replacement alone accounts for 6 parts.

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

9 Radiator Cap parts are listed for the 2015 Kia Optima, from CALORSTAT, GATES, MOTORAD and 2 other brands. MOTORAD T16R carries the "Popular" badge. All of them fit every engine offered in the 2015 Optima.

The Locking Replacement section: 4 options from CALORSTAT, GATES and MOTORAD. CALORSTAT RC0213 is listed in this group.

The Standard Replacement section: 5 options from MOTORAD, SKP, CALORSTAT and 2 other brands. MOTORAD T16R is listed in this group.

Part numbers include MOTORAD T16R, CALORSTAT RC0213 and CALORSTAT RC0212, among others listed above.

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

21 Radiator Fan Assembly parts for the 2015 Kia Optima come from 10 brands — GPD, FOUR SEASONS, TYC and 7 other brands. The "Popular" part is DORMAN 620983.

The Economy section: 7 options from GPD, TECHPRO, DORMAN and 1 other brand. DORMAN 620983 is listed in this group.

Standard Replacement: 14 parts, from FOUR SEASONS, TYC, AGILITY and 3 other brands. A representative part number is FOUR SEASONS 75979.

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

3 Radiator Fan Resistor parts are listed for the 2015 Kia Optima, from AUTOTECNICA, GATES and STANDARD MOTOR PRODUCTS. 2 parts fit every engine; the other 1 is engine-specific.

Part numbers include AUTOTECNICA KI0719959, GATES FCM150 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

20 Radiator Hose parts for the 2015 Kia Optima come from 5 brands — CONTINENTAL, DAYCO, GATES and 2 other brands. The "Popular" part is ACDELCO 27092X.

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

14 Temperature Sender / Sensor parts are listed for the 2015 Kia Optima, from GPD, HOLSTEIN, UNITED MOTOR PRODUCTS and 11 other brands. BECK/ARNLEY 1581695 carries the "Popular" badge. All of them fit every engine offered in the 2015 Optima.

Economy: 4 parts, from GPD, HOLSTEIN, UNITED MOTOR PRODUCTS and 1 other brand. A representative part number is GPD 1712556.

The Standard Replacement section: 10 options from BECK/ARNLEY, FOUR SEASONS, STANDARD MOTOR PRODUCTS and 7 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

32 Thermostat parts for the 2015 Kia Optima come from 9 brands — CALORSTAT, MOTORAD, FACET and 6 other brands. The "Popular" part is AISIN THK007. Grades run from Premium through Standard Replacement; Standard Replacement is the most populated section, led by CALORSTAT, FACET, AISIN and 6 other brands.

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

15 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2015 Kia Optima, from FEL-PRO, VICTOR REINZ, MAHLE / CLEVITE and 3 other brands. FEL-PRO 35921 carries the "Popular" badge. 10 parts fit every engine; the other 5 are engine-specific.

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

21 Thermostat Housing / Water Outlet parts for the 2015 Kia Optima come from 9 brands — MOTORAD, GATES, HYUNDAI and 6 other brands. The "Popular" part is DORMAN 9025994. 2 parts fit every engine; the other 19 are engine-specific.

The Economy section: 6 options from DORMAN, SKP, AUTOTECNICA and 1 other brand. DORMAN 9025994 is listed in this group.

Standard Replacement: 13 parts, from MOTORAD, GATES, FOUR SEASONS and 2 other brands. A representative part number is MOTORAD CH5126.

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

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 2015 Kia Optima, from AJUSA, APEX and FEL-PRO. 2 parts fit every engine; the other 1 is engine-specific.

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

33 Water Pump parts for the 2015 Kia Optima come from 14 brands — GATES, GMB, DAYCO and 11 other brands. The "Popular" part is FAMOUS BRAND 1600424904. Economy and Standard Replacement are all represented, and Standard Replacement alone accounts for 20 parts.