2005 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

13 Coolant / Antifreeze parts for the 2005 Kia Optima come from 5 brands — PRESTONE, PEAK, BECK/ARNLEY and 2 other brands. The "Popular" part is FVP MV5050GAL. Every part fits both the 2.4L L4 and the 2.7L V6.

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 3 options from FVP, PRESTONE and PEAK — the catalog's value-priced group. FVP MV5050GAL is listed in this group.

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, BECK/ARNLEY, AISIN and PEAK supply 4 parts: built to original-equipment specification. A representative part number is AISIN ACG004.

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

3 Coolant Hose / Pipe Seal parts are listed for the 2005 Kia Optima, from AJUSA and HYUNDAI. 1 part fits every engine; the other 2 are engine-specific.

Listed part numbers: AJUSA 16022400, AJUSA 16060600 and HYUNDAI 2546221000.

This table covers the Coolant Hose Connector flanges. Read more

This group shows a single part: FOUR SEASONS 85395.

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

One part is listed for the 2005 Kia Optima — TECHPRO HY3014108.

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

One part is listed for the 2005 Kia Optima — CALORSTAT RC0204.

This table covers the Cooling Fan control modules. Read more

US MOTOR WORKS supplies the 3 Cooling Fan Control Module parts for the 2005 Kia Optima. All of them fit every engine offered in the 2005 Optima.

Part numbers include US MOTOR WORKS 16749, US MOTOR WORKS 16789 and US MOTOR WORKS 16795.

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

4 Cooling System Tester Adapter parts for the 2005 Kia Optima come from 3 brands — MOTORAD, GATES and STANT. Every part fits both the 2.4L L4 and the 2.7L V6.

This group includes GATES 31428, MOTORAD 3121 and MOTORAD 3122 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

13 Radiator parts for the 2005 Kia Optima come from 12 brands — NISSENS, FAMOUS BRAND, ULTRA-POWER and 9 other brands. The "Popular" part is CSF 2928. 12 parts fit every engine; the other 1 is engine-specific.

The Economy section: 2 options from FAMOUS BRAND and ULTRA-POWER. FAMOUS BRAND 431501 is listed in this group.

Standard Replacement: 11 parts, from NISSENS, CSF, DENSO and 7 other brands. A representative part number is CSF 2928.

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 for the 2005 Kia Optima come from 6 brands — CALORSTAT, GATES, MOTORAD and 3 other brands. The "Popular" part is MOTORAD T16R. Every part fits both the 2.4L L4 and the 2.7L V6.

In the Locking Replacement grade, CALORSTAT, GATES and MOTORAD supply 3 parts: grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. A representative part number is CALORSTAT RC0212.

Standard Replacement: 6 parts, from MOTORAD, SKP, CALORSTAT and 3 other brands. A representative part number is MOTORAD T16R.

Listed part numbers: MOTORAD T16R, CALORSTAT RC0212 and GATES 31534, plus the other parts above.

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

9 Radiator Fan Assembly parts are listed for the 2005 Kia Optima, from DORMAN, SKP, GPD and 6 other brands. DORMAN 620716 carries the "Popular" badge. All of them fit every engine offered in the 2005 Optima.

Economy: 4 parts, from DORMAN, SKP, GPD and 1 other brand. A representative part number is DORMAN 620716.

The Standard Replacement section: 5 options from AGILITY, FOUR SEASONS, TYC and 2 other brands. AGILITY 6020105 is listed in this group.

This group includes DORMAN 620716, SKP SK620716 and GPD 2811307 and the remaining parts 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

4 Radiator Fan Motor parts for the 2005 Kia Optima come from 4 brands — FOUR SEASONS, GPD, TYC and 1 other brand. Every part fits both the 2.4L L4 and the 2.7L V6.

Listed part numbers: FOUR SEASONS 75766, GPD 2312223 and TYC 631260, 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

17 Radiator Hose parts are listed for the 2005 Kia Optima, from DAYCO, CONTINENTAL, ACDELCO and 1 other brand. DAYCO 81051 carries the "Popular" badge.

Economy: 2 parts, from DAYCO and CONTINENTAL. A representative part number is DAYCO 81051.

The Standard Replacement section: 7 options from DAYCO, ACDELCO, GATES and 1 other brand. DAYCO 70806 is listed in this group.

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

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

18 Temperature Sender / Sensor parts for the 2005 Kia Optima come from 14 brands — STANDARD MOTOR PRODUCTS, HOLSTEIN, GPD and 11 other brands. The "Popular" part is HOLSTEIN 2CTS0282. 17 parts fit every engine; the other 1 is engine-specific.

The Economy section: 6 options from HOLSTEIN, STANDARD MOTOR PRODUCTS, GPD and 1 other brand. HOLSTEIN 2CTS0282 is listed in this group.

Standard Replacement: 11 parts, from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, DELPHI and 7 other brands. A representative part number is STANDARD MOTOR PRODUCTS TX6.

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

24 Thermostat parts are listed for the 2005 Kia Optima, from MOTORAD, CALORSTAT, ACKOJA and 8 other brands. MOTORAD 5302170 carries the "Popular" badge.

The Heavy Duty section lists 2 options from MOTORAD — rated for severe service. MOTORAD 5302170 is listed in this group.

The Premium section: 2 options from MOTORAD. MOTORAD 7302170 is listed in this group.

The Standard Replacement section: 11 options from MOTORAD, CALORSTAT, GATES and 5 other brands. GATES 33878 is listed in this group.

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

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 2005 Kia Optima come from 7 brands — FEL-PRO, APEX, HYUNDAI and 4 other brands. The "Popular" part is FEL-PRO 35764. 4 parts fit every engine; the other 11 are engine-specific.

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

11 Thermostat Housing / Water Outlet parts are listed for the 2005 Kia Optima, from MOTORAD, DORMAN, FAMOUS BRAND and 4 other brands. DORMAN 9025918 carries the "Popular" badge.

Economy: 4 parts, from DORMAN and FAMOUS BRAND. A representative part number is DORMAN 9025918.

The Standard Replacement section: 6 options from MOTORAD, GATES, HYUNDAI and 1 other brand. MOTORAD CH6038 is listed in this group.

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

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

26 Water Pump parts are listed for the 2005 Kia Optima, from SKP, US MOTOR WORKS, ACKOJA and 13 other brands. CARDONE 571574 carries the "Popular" badge. Grades run from Economy through Standard Replacement; Standard Replacement is the most populated section, led by ACDELCO, AISIN, DAYCO and 4 other brands.

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

10 Water Pump Gasket parts for the 2005 Kia Optima come from 5 brands — FEL-PRO, MAHLE / CLEVITE, APEX and 2 other brands. The "Popular" part is FEL-PRO 35765.