Allmotorparts Thermostat Replacement for Hyundai & Kia 2.4L — 25500-2GGA0 with Gasket, OE-fit Stainless Flange

Allmotorparts replacement thermostat (with gasket) controls coolant flow to help the 2.4L L4 engine reach and maintain correct operating temperature.

This aftermarket thermostat is built as an OE-style replacement designed to fit Hyundai and Kia 2.4L L4 models that originally used part number 25500-2GGA0 (255002GGA0). It includes a gasket and a stainless-steel mounting flange and spring-frame construction intended to match the original fit and function while offering durable materials for repeated thermal cycles. Before ordering, confirm compatibility with your vehicle year and model listed below.

How will I know the thermostat needs replacement?

If the thermostat starts to fail, your vehicle may show several clear symptoms that point to restricted or stuck coolant flow. Watch for temperature gauge highs or lows, rapid or erratic temp changes, and visible coolant leaks near the thermostat housing.

• High temperature gauge reading or engine overheating under load.
• Low or unusually cool engine temperature indicating stuck-open valve.
• Temperature needle that jumps or fluctuates while driving.
• Coolant residue or puddles around thermostat housing or under the car.

Which Hyundai and Kia models will this thermostat fit?

This Allmotorparts unit replaces factory 25500-2GGA0 thermostats used on specific Hyundai and Kia 2.4L L4 vehicles. Check your vehicle year and engine size to confirm compatibility before purchase.

• Hyundai: 2019–2020 Santa Fe, 2017–2018 Santa Fe Sport, 2015–2019 Sonata, 2018–2021 Tucson.
• Kia: 2016–2020 Optima, 2016–2020 Sorento, 2017–2022 Sportage.
• Replaces part numbers: 25500-2GGA0 and 255002GGA0 (thermostat with gasket).
• Not a genuine OEM part; aftermarket replacement manufactured by Allmotorparts.

What are the construction and performance features?

The design focuses on OE-style fit, durable materials, and a robust spring frame to withstand repeated thermal cycling. A stainless-steel mounting flange helps ensure proper seating in the outlet casting to reduce leaks and maintain reliable coolant control.

• OE fit, form, and function aimed to meet or exceed original performance.
• Stainless-steel mounting flange for consistent seat and leak resistance.
• Channel-constructed stainless spring frame for strength and durability.
• Includes matching gasket for a complete thermostat-to-housing seal.

Are there installation tips or orientation details I should know?

Correct installation orientation matters for some thermostat designs that include a jiggle pin or check valve to vent air. Make sure the jiggle pin sits at the 12 o'clock position if your thermostat includes it, and always follow factory tightening sequences and torque specs for the housing.

• If present, position the jiggle pin/check valve at the 12 o'clock (north) location for proper bleeding.
• Replace the gasket and clean mating surfaces to prevent leaks.
• Bleed the cooling system according to vehicle-specific procedures after installation.
• Verify hose routing and clamp tightness to avoid coolant loss.

Who is this for: This Allmotorparts thermostat is intended for DIY mechanics and professional technicians who need a reliable aftermarket replacement for Hyundai and Kia 2.4L L4 engines using part 25500-2GGA0. It suits owners who need an OE-style fit and a complete gasket-included swap, but note it is not an OEM-branded component. Confirm your vehicle year and engine type against the compatibility list before ordering to ensure a correct fit.