Water Pump for Hyundai ix35, Sonata, H1 & Kia Sportage, Optima Theta II (WA037)

Vehicle Fitment & Part Details

The WA037 water pump (OE ref. 25100-2G500) is a direct replacement for Hyundai ix35, Tucson, Sonata, H1 and Kia Sportage, Optima, Sorento models fitted with the Theta II engine family (G4NA, G4KE, G4KC, G4KD, G4KG, G4KJ). Features a 6-blade impeller. The water pump circulates coolant through the engine cooling system. Always confirm the OE number against your vehicle before ordering.

Key Details

SKU

WA037

Component

Water Pump

Brand

Partquip

Primary Fitment

Hyundai ix35 / Kia Sportage III

Key Benefits

• Direct OE-equivalent replacement with 6-blade impeller for the Hyundai/Kia Theta II engine family
• Covers Hyundai ix35, Tucson, Sonata, H1 plus Kia Sportage, Optima and Sorento 2.0–2.4 petrol models from 2009 onward
• Single pump fits multiple Theta II variants (G4KD, G4KE, G4KC, G4KJ, G4NA)

Product Specifications

OEM Reference Numbers

• Hyundai / Kia: 25100-2G500, 251002G650, 251102G500

Vehicle Fitment

Fitment Notes

• Always verify the OE part number stamped on your existing water pump before ordering. Fitment data is provided as a guide and may not cover every sub-variant.
• The Theta II engine family spans 2.0–2.4 L in naturally aspirated and GDi configurations. All variants listed share this water pump.

Installation / Use / Maintenance Tips

• Drain the cooling system completely before removing the old water pump to minimise coolant loss and contamination.
• Clean all gasket mating surfaces thoroughly — do not reuse old gaskets or seals.
• Inspect the thermostat, radiator hoses and drive belt while the pump is accessible; replace any worn components at the same time.
• Refill with the manufacturer-recommended coolant type and concentration, and bleed all air from the system before starting the engine.
• Run the engine to operating temperature and check for leaks around the pump housing, hose connections and bleed points.

Common Questions

Will this water pump fit my vehicle?

Check the fitment table above and confirm the OE reference number matches the one on your current water pump. If your vehicle and engine code appear in the table and the OE number matches, this pump is a direct fit.

What do the OEM reference numbers mean?

OEM (Original Equipment Manufacturer) reference numbers are the part numbers assigned by the vehicle manufacturer. They let you cross-reference this aftermarket part against the original to confirm compatibility.

Is Partquip the same as MAP Pro?

No. Partquip is an independent aftermarket brand. MAP Pro is the house brand of Modern Auto Parts. Both are available in our store, but they are separate brands with their own product lines.

Are there other variants of this water pump?

This listing covers SKU WA037 for Theta II engines. For Gamma-family engines (1.4–1.6 L), see WA035 or WA036. Search “water pump” in our store for more options.