2008 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 2008 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 2008 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

2 Coolant Hose / Pipe Seal parts for the 2008 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 2008 Kia Optima — FOUR SEASONS 86334.

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 2008 Kia Optima come from 3 brands — CALORSTAT, DORMAN and MOTORAD. Every part fits both the 2.4L L4 and the 2.7L V6.

Part numbers include CALORSTAT RC0161, DORMAN 54018 and MOTORAD T163.

This table covers the Cooling Fan control modules. Read more

2 Cooling Fan Control Module parts for the 2008 Kia Optima come from US MOTOR WORKS.

Part numbers include 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 2008 Kia Optima, from MOTORAD, GATES and STANT. All of them fit every engine offered in the 2008 Optima.

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

17 Radiator parts are listed for the 2008 Kia Optima, from OSC, FVP, NISSENS and 10 other brands. ULTRA-POWER 13060 carries the "Popular" badge. 12 parts fit every engine; the other 5 are engine-specific.

Economy: 3 parts, from ULTRA-POWER, GPD and OSC. A representative part number is ULTRA-POWER 13060.

The Standard Replacement section: 14 options from FVP, NISSENS, OSC and 8 other brands. CSF 3406 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

8 Radiator Cap parts are listed for the 2008 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 2008 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: 5 options from MOTORAD, SKP, CALORSTAT and 2 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

14 Radiator Fan Assembly parts for the 2008 Kia Optima come from 10 brands — GPD, ULTRA-POWER, FOUR SEASONS and 7 other brands. The "Popular" part is DORMAN 620458. 1 part fits every engine; the other 13 are engine-specific.

The Economy section: 5 options from GPD, ULTRA-POWER and DORMAN. DORMAN 620458 is listed in this group.

Standard Replacement: 9 parts, from FOUR SEASONS, AGILITY, TYC and 4 other brands. A representative part number is FOUR SEASONS 76226.

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

One part is listed for the 2008 Kia Optima — AUTO 7 3150105.

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

12 Radiator Hose parts for the 2008 Kia Optima come from 4 brands — GATES, DAYCO, ACDELCO and 1 other brand. The "Popular" part is DAYCO 72589.

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 2008 Kia Optima, from STANDARD MOTOR PRODUCTS, HOLSTEIN, GPD and 10 other brands. HOLSTEIN 2CTS0091 carries the "Popular" badge.

Economy: 4 parts, from HOLSTEIN, STANDARD MOTOR PRODUCTS, GPD and 1 other brand. A representative part number is HOLSTEIN 2CTS0091.

The Standard Replacement section: 10 options from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, DELPHI and 7 other brands. STANDARD MOTOR PRODUCTS TX122 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

11 Thermostat parts for the 2008 Kia Optima come from 9 brands — MOTORAD, HYUNDAI, CALORSTAT and 6 other brands. The "Popular" part is CALORSTAT TH629482.

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

8 Thermostat / Thermostat Housing / Water Outlet Seal parts are listed for the 2008 Kia Optima, from FEL-PRO, VICTOR REINZ, APEX and 1 other brand. FEL-PRO 35368 carries the "Popular" badge.

Part numbers include FEL-PRO 35368, VICTOR REINZ 711359000 and APEX AWO2093, among others listed above.

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

3 Thermostat Housing / Water Outlet parts for the 2008 Kia Optima come from 2 brands — MOTORAD and FOUR SEASONS.

Listed part numbers: FOUR SEASONS 86287, MOTORAD CH3114 and MOTORAD CH2008.

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

2 Water Inlet Gasket parts are listed for the 2008 Kia Optima, from AJUSA and MAHLE / CLEVITE.

Listed part numbers: AJUSA 01113800 and MAHLE / CLEVITE C32200.

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

14 Water Pump parts for the 2008 Kia Optima come from 11 brands — BECK/ARNLEY, DAYCO, GMB and 8 other brands. The "Popular" part is DAYCO DP738B.

The Economy section: 6 options from BECK/ARNLEY, ACKOJA, FVP and 2 other brands. ACKOJA A5350009 is listed in this group.

Standard Replacement: 8 parts, from DAYCO, GMB, GATES and 3 other brands. A representative part number is DAYCO DP738B.

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

9 Water Pump Gasket parts are listed for the 2008 Kia Optima, from FEL-PRO, BECK/ARNLEY, VICTOR REINZ and 3 other brands. FEL-PRO 35813 carries the "Popular" badge.

Listed part numbers: FEL-PRO 35813, 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 for the 2008 Kia Optima come from 2 brands — APEX and FEL-PRO.

This group includes APEX AWP3203 and FEL-PRO ES72872.