2004 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 are listed for the 2004 Kia Optima, from PRESTONE, PEAK, BECK/ARNLEY and 2 other brands. FVP MV5050GAL carries the "Popular" badge. All of them fit every engine offered in the 2004 Optima.

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 4 options from BECK/ARNLEY, AISIN and PEAK — built to original-equipment specification. AISIN ACG004 is listed in this group.

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 for the 2004 Kia Optima come from 2 brands — AJUSA and HYUNDAI. 1 part fits every engine; the other 2 are engine-specific.

This group includes AJUSA 16022400, AJUSA 16060600 and HYUNDAI 2546221000.

This table covers the Coolant Hose Connector flanges. Read more

One part is listed for the 2004 Kia Optima — FOUR SEASONS 85395.

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

This group shows a single part: 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

This group shows a single part: CALORSTAT RC0204.

This table covers the Cooling Fan control modules. Read more

3 Cooling Fan Control Module parts for the 2004 Kia Optima come from US MOTOR WORKS. Every part fits both the 2.4L L4 and the 2.7L V6.

This group includes 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 are listed for the 2004 Kia Optima, from MOTORAD, GATES and STANT. All of them fit every engine offered in the 2004 Optima.

Listed part numbers: GATES 31428, MOTORAD 3121 and MOTORAD 3122, 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 are listed for the 2004 Kia Optima, from NISSENS, FAMOUS BRAND, ULTRA-POWER and 9 other brands. CSF 2928 carries the "Popular" badge. 12 parts fit every engine; the other 1 is engine-specific.

Economy: 2 parts, from FAMOUS BRAND and ULTRA-POWER. A representative part number is FAMOUS BRAND 431501.

The Standard Replacement section: 11 options from NISSENS, CSF, DENSO and 7 other brands. CSF 2928 is listed in this group.

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 2004 Kia Optima, from CALORSTAT, GATES, MOTORAD and 3 other brands. MOTORAD T16R carries the "Popular" badge. All of them fit every engine offered in the 2004 Optima.

The Locking Replacement section lists 3 options from CALORSTAT, GATES and MOTORAD — grouped under the catalog's "Locking Replacement" designation — the notes column spells out what sets them apart. CALORSTAT RC0212 is listed in this group.

The Standard Replacement section: 6 options from MOTORAD, SKP, CALORSTAT and 3 other brands. MOTORAD T16R is listed in this group.

This group includes MOTORAD T16R, CALORSTAT RC0212 and GATES 31534 and the remaining 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 for the 2004 Kia Optima come from 9 brands — DORMAN, SKP, GPD and 6 other brands. The "Popular" part is DORMAN 620716. Every part fits both the 2.4L L4 and the 2.7L V6.

The Economy section: 4 options from DORMAN, SKP, GPD and 1 other brand. DORMAN 620716 is listed in this group.

Standard Replacement: 5 parts, from AGILITY, FOUR SEASONS, TYC and 2 other brands. A representative part number is AGILITY 6020105.

Part numbers include DORMAN 620716, SKP SK620716 and GPD 2811307, 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

4 Radiator Fan Motor parts are listed for the 2004 Kia Optima, from FOUR SEASONS, GPD, TYC and 1 other brand. All of them fit every engine offered in the 2004 Optima.

This group includes FOUR SEASONS 75766, GPD 2312223 and TYC 631260 and the remaining 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 for the 2004 Kia Optima come from 4 brands — DAYCO, CONTINENTAL, ACDELCO and 1 other brand. The "Popular" part is DAYCO 81051.

The Economy section: 2 options from DAYCO and CONTINENTAL. DAYCO 81051 is listed in this group.

Standard Replacement: 7 parts, from DAYCO, ACDELCO, GATES and 1 other brand. A representative part number is DAYCO 70806.

8 further parts sit outside the graded sections, 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 are listed for the 2004 Kia Optima, from STANDARD MOTOR PRODUCTS, HOLSTEIN, GPD and 11 other brands. HOLSTEIN 2CTS0282 carries the "Popular" badge. 17 parts fit every engine; the other 1 is engine-specific.

Economy: 6 parts, from HOLSTEIN, STANDARD MOTOR PRODUCTS, GPD and 1 other brand. A representative part number is HOLSTEIN 2CTS0282.

The Standard Replacement section: 11 options from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, DELPHI and 7 other brands. STANDARD MOTOR PRODUCTS TX6 is listed in this group.

1 ungrouped part is not assigned to a grade, 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 for the 2004 Kia Optima come from 11 brands — MOTORAD, CALORSTAT, ACKOJA and 8 other brands. The "Popular" part is MOTORAD 5302170.

In the Heavy Duty grade, MOTORAD supplies 2 parts: rated for severe service. A representative part number is MOTORAD 5302170.

Premium: 2 parts, from MOTORAD. A representative part number is MOTORAD 7302170.

Standard Replacement: 11 parts, from MOTORAD, CALORSTAT, GATES and 5 other brands. A representative part number is GATES 33878.

9 further parts sit outside the graded sections, 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

17 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2004 Kia Optima, from FEL-PRO, MAHLE / CLEVITE, APEX and 5 other brands. FEL-PRO 35764 carries the "Popular" badge. 4 parts fit every engine; the other 13 are engine-specific.

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

11 Thermostat Housing / Water Outlet parts for the 2004 Kia Optima come from 7 brands — MOTORAD, DORMAN, FAMOUS BRAND and 4 other brands. The "Popular" part is DORMAN 9025918.

The Economy section: 4 options from DORMAN and FAMOUS BRAND. DORMAN 9025918 is listed in this group.

Standard Replacement: 6 parts, from MOTORAD, GATES, HYUNDAI and 1 other brand. A representative part number is MOTORAD CH6038.

1 further part sits outside the graded sections, 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

12 Water Pump parts for the 2004 Kia Optima come from 12 brands — SKP, ACKOJA, FVP and 9 other brands. The "Popular" part is SKP SK1462040.

The Economy section: 5 options from SKP, ACKOJA, FVP and 2 other brands. SKP SK1462040 is listed in this group.

Standard Replacement: 7 parts, from ACDELCO, AISIN, DAYCO and 4 other brands. A representative part number is ACDELCO 252839.

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 are listed for the 2004 Kia Optima, from FEL-PRO, MAHLE / CLEVITE, APEX and 2 other brands. FEL-PRO 35765 carries the "Popular" badge.