2012 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 for the 2012 Kia Optima come from 6 brands — PRESTONE, VALVOLINE, PEAK 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, VALVOLINE supplies 1 part: rated for severe service. A representative part number is VALVOLINE ZXG051.

In the Premium grade, PRESTONE and PEAK supply 5 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, BECK/ARNLEY, AISIN and 1 other brand supply 7 parts: built to original-equipment specification. A representative part number is VALVOLINE 861398.

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

This group shows a single part: 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 are listed for the 2012 Kia Optima, from HYUNDAI and VICTOR REINZ.

Listed part numbers: HYUNDAI 2546221000 and VICTOR REINZ 151118601.

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

One part is listed for the 2012 Kia Optima — 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

MOTORAD supplies the 3 Coolant Reservoir Cap parts for the 2012 Kia Optima.

The Locking Replacement section lists 1 option from MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. MOTORAD ST13R is listed in this group.

The Standard Replacement section: 1 option from MOTORAD. MOTORAD T13R is listed in this group.

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

Part numbers include MOTORAD ST13R, MOTORAD T13R and MOTORAD T142.

This table covers the Cooling Fan control modules. Read more

4 Cooling Fan Control Module parts are listed for the 2012 Kia Optima, from US MOTOR WORKS and STANDARD MOTOR PRODUCTS.

Listed part numbers: STANDARD MOTOR PRODUCTS RY2026, US MOTOR WORKS 16749 and US MOTOR WORKS 16789, 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 for the 2012 Kia Optima come from 3 brands — MOTORAD, GATES and STANT.

Listed part numbers: GATES 31428, MOTORAD 3121 and MOTORAD 3122, plus the other parts above.

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

2 Intercooler parts for the 2012 Kia Optima come from 2 brands — TECHPRO and TYC.

Part numbers include TECHPRO HY3012100 and TYC 13468.

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

7 Inverter Cooler parts are listed for the 2012 Kia Optima, from DORMAN, CSF, DENSO and 4 other brands. CSF 3678 carries the "Popular" badge.

Economy: 1 part, from DORMAN. A representative part number is DORMAN 918570.

The Standard Replacement section: 6 options from CSF, DENSO, AGILITY and 3 other brands. CSF 3678 is listed in this group.

Listed part numbers: CSF 3678, DORMAN 918570 and DENSO 2219446, plus the other 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

13 Radiator parts for the 2012 Kia Optima come from 10 brands — CSF, KOYORAD, UAC and 7 other brands. The "Popular" part is CSF 3756.

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

8 Radiator Cap parts for the 2012 Kia Optima come from 4 brands — CALORSTAT, GATES, MOTORAD and 1 other brand. The "Popular" part is MOTORAD T16R.

Locking Replacement: 4 parts, from CALORSTAT, GATES and MOTORAD. A representative part number is CALORSTAT RC0213.

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

This group includes MOTORAD T16R, CALORSTAT RC0213 and CALORSTAT RC0212 and the remaining parts above.

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

7 Radiator Fan Assembly parts are listed for the 2012 Kia Optima, from DORMAN, GPD, TECHPRO and 4 other brands. AGILITY 6010083 carries the "Popular" badge.

Economy: 3 parts, from DORMAN, GPD and TECHPRO. A representative part number is DORMAN 620448.

The Standard Replacement section: 4 options from AGILITY, TYC, ACKOJA and 1 other brand. AGILITY 6010083 is listed in this group.

Part numbers include AGILITY 6010083, DORMAN 620448 and GPD 2812024, among others listed above.

This table covers the Radiator Fan motors. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor. Read more

This group shows a single part: ACKOJA A52010002.

This table covers the Radiator Fan resistors. Read more

2 Radiator Fan Resistor parts for the 2012 Kia Optima come from 2 brands — GATES and STANDARD MOTOR PRODUCTS.

Part numbers include GATES FCM150 and STANDARD MOTOR PRODUCTS RY2022.

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

9 Radiator Hose parts are listed for the 2012 Kia Optima, from CONTINENTAL, GATES, ACDELCO and 1 other brand. CONTINENTAL 63818 carries the "Popular" badge.

This group includes CONTINENTAL 63818, GATES 23906 and ACDELCO 27092X 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

14 Temperature Sender / Sensor parts for the 2012 Kia Optima come from 14 brands — GPD, HOLSTEIN, UNITED MOTOR PRODUCTS and 11 other brands. The "Popular" part is BECK/ARNLEY 1581695.

The Economy section: 4 options from GPD, HOLSTEIN, UNITED MOTOR PRODUCTS and 1 other brand. GPD 1712556 is listed in this group.

Standard Replacement: 10 parts, from BECK/ARNLEY, DELPHI, STANDARD MOTOR PRODUCTS and 7 other brands. A representative part number is BECK/ARNLEY 1581695.

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

10 Thermostat parts are listed for the 2012 Kia Optima, from CALORSTAT, FACET, MOTORAD and 4 other brands. AISIN THYK802 carries the "Popular" badge.

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 for the 2012 Kia Optima come from 5 brands — FEL-PRO, MAHLE / CLEVITE, VICTOR REINZ and 2 other brands. The "Popular" part is FEL-PRO 35921.

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

11 Thermostat Housing / Water Outlet parts are listed for the 2012 Kia Optima, from DORMAN, SKP, FOUR SEASONS and 3 other brands. DORMAN 9025994 carries the "Popular" badge.

Economy: 4 parts, from DORMAN and SKP. A representative part number is DORMAN 9025994.

The Standard Replacement section: 5 options from FOUR SEASONS, MOTORAD and GATES. FOUR SEASONS 86027 is listed in this group.

2 ungrouped parts are not assigned to a grade, 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 for the 2012 Kia Optima come from 3 brands — AJUSA, APEX and FEL-PRO.

Listed part numbers: 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

11 Water Pump parts are listed for the 2012 Kia Optima, from FVP, DAYCO, HYUNDAI and 5 other brands. US MOTOR WORKS US8982 carries the "Popular" badge.

Economy: 3 parts, from US MOTOR WORKS, BECK/ARNLEY and FVP. A representative part number is US MOTOR WORKS US8982.

The Standard Replacement section: 8 options from DAYCO, HYUNDAI, AISIN and 3 other brands. AISIN WPK808 is listed in this group.

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

8 Water Pump Gasket parts for the 2012 Kia Optima come from 5 brands — FEL-PRO, MAHLE / CLEVITE, VICTOR REINZ and 2 other brands. The "Popular" part is FEL-PRO 35802.

Listed part numbers: FEL-PRO 35802, MAHLE / CLEVITE K32192 and APEX AWP3215, plus the other parts above.

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 are listed for the 2012 Kia Optima, from APEX and FEL-PRO.

Part numbers include APEX AWP3203 and FEL-PRO ES72872.