








Engine Thermostat for Hyundai i40 Sonata Kia Optima 2.0L 2.4L 25500-23010
Direct Fit Replaces 25500-23010
BRAND NEW *OEM Quality* 82 degree engine thermostat to suit Hyundai and Kia 2.0L and 2.4L petrol mid-size sedans and wagons.
An erratic temperature gauge or a heater that goes cold on the freeway usually points to a thermostat sticking open - this direct replacement restores steady temperature and ships same-day before 12pm from Cranbourne VIC.
TO SUIT
- Hyundai i40 VF 2.0L G4NC (2011-2018)
- Hyundai i45 YF 2.0L G4NA (2010-2015)
- Hyundai Sonata NF 2.4L G4KC (2005-2010)
- Kia Optima TF 2.4L G4KJ (2011-2015) and Magentis MG 2.4L G4KC (2006-2009)
OEM PART NUMBERS
- 25500-23010
- 25500-23001
- 25500-2E000
- 25500-25001
OTHER PART NUMBERS
- DAYCO: DT131A
- GATES: TH29882G1
PACKAGE INCLUDES
1 x 82 degree C engine thermostat (54mm diameter / 42mm height) with rubber sealing gasket - no housing.
ABOUT THIS THERMOSTAT
On the Theta G4KC/G4KJ and Nu G4NA/G4NC engines the thermostat sets warm-up speed and steady running temperature. On a sedan that does long freeway runs a thermostat stuck open lets the engine run well below 82 degrees.
That costs fuel economy, slows cabin heating and can log a P0128 code - a quick fix with this direct-fit unit.
COMMON SYMPTOMS OF FAILURE
- Temperature gauge climbing into the red or engine overheating
- Gauge staying low or dropping on the highway (stuck open)
- Heater blowing cold or lukewarm air
- Check engine light with fault code P0128
- Poor fuel economy from the engine running cold
COMMON QUESTIONS
What temperature does this thermostat open at?
82 degrees C - the factory specification for these engines.
- [02/15 - 12/18] HYUNDAI i40 VF I (2.0L 4cyl G4NC 122kW)
- [12/14 - 12/18] HYUNDAI i40 VF I GDi (2.0L 4cyl G4NC 121kW)
- [07/11 - 02/15] HYUNDAI i40 VF I GDI (2.0L 4cyl G4NC 130kW)
- [03/12 - 02/15] HYUNDAI i40 VF I GDI (2.0L 4cyl G4NC 131kW)
- [09/10 - 12/15] HYUNDAI i45 YF VI (2.0L 4cyl G4NA 115kW)
- [06/05 - 05/08] HYUNDAI SONATA NF V (2.4L 4cyl G4KC 119kW)
- [06/08 - 12/10] HYUNDAI SONATA NF V (2.4L 4cyl G4KC 128kW)
- [08/06 - 12/09] KIA MAGENTIS MG II (2.4L 4cyl G4KC 119kW)
- [01/11 - 08/15] KIA OPTIMA FSGDS6B / TF (2.4L 4cyl G4KJ 149kW)
| Identification | |
|---|---|
| SKU | DT131A-4 |
| Brand | Aftermarket OEM Replacement |
| Part Numbers | |
| Part Number | DT131A |
| Reference OEM Number | 25500-23010 |
| Other OEM Numbers | 25500-2E000, 25500-25001, 25500-23010, 25500-23001 |
| Related Part Numbers | TH29882G1, DT131A, TT373-180, ST145-180 |
| Trade Part Numbers | DAYCO-AU: DT131A, GATES-AU: TH29882G1 |
| Product Specifics | |
| Product Type | Thermostat |
| Supplementary Article Info | with gasket / seal |
| Height | 42 mm |
| Housing Type | without housing |
| Opening Temperature | 82 Degrees Celsius |
| Compatible Makes | Hyundai, Kia |
| Fitment Type | Direct Replacement |
| Diameter | 54 mm |
| Other Details | |
| Note | Always verify fitment using your vehicle's OEM part number. |
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