Summary
Hyundai Wia is trying to build a new growth engine alongside its traditional automotive-parts business.
The company began mass production at its new plant in Martin, Slovakia, at the end of September. The facility can produce up to 280,000 coolant modules and 800,000 constant-velocity joints annually.
Hyundai Wia plans to broaden the Slovak product mix further by adding HVAC modules, while continued investment could expand constant-velocity-joint capacity significantly over time.
The timing matters because thermal management is already growing much faster than the company as a whole. Second-quarter thermal-management sales increased 305.1% year over year, while consolidated revenue rose 8.0%. Operating profit, however, fell 10.6%, leaving the company-wide operating margin at only 2.1%.
That divergence defines the investment case.
The technology is moving into production.
The production footprint is moving overseas.
But the earnings mix has not yet changed enough to prove that thermal management can lift Hyundai Wia out of its historically low-margin structure.
The central investment question is therefore:
Can thermal management become large and profitable enough to reshape Hyundai Wia’s earnings profile?
Key Takeaways
- ✓ Hyundai Wia’s new Slovakia plant can produce 280,000 coolant modules and 800,000 constant-velocity joints annually.
- ✓ Second-quarter thermal-management sales increased 305.1% year over year, although the company does not separately disclose the absolute revenue contribution.
- ✓ Consolidated operating margin remained only 2.1% in 2Q26, showing that rapid new-business growth has not yet translated into a margin reset.
- ✓ Hyundai Wia is expanding its thermal-management portfolio across coolant modules, HVAC, integrated coolant-refrigerant modules, e-compressors and electronic controllers.
- ✓ At KRW 52,900, the stock trades at approximately 9.6x 2026E earnings and 7.6x 2027E earnings based on current consensus estimates.
What Happened
Hyundai Wia began mass production at its new Slovak manufacturing plant in Martin following a production ceremony held on September 30.
The company relocated its existing Slovak constant-velocity-joint operations to the larger facility to prepare for higher volumes and establish a more stable European manufacturing base.
The new plant has annual production capacity of up to 800,000 constant-velocity joints and 280,000 coolant modules.
Hyundai Wia plans to increase production capacity further through continued investment. The company has stated that Slovak constant-velocity-joint capacity could ultimately expand by as much as fivefold.
It also plans to broaden the factory’s product portfolio from coolant modules into HVAC modules.
Hyundai Wia said the Slovak operation will supply driveline and thermal-management components to Hyundai Motor, Kia and other global automakers. The facility is also expected to support European electric-vehicle programs including Kia’s EV2 and EV4.
Employment at the operation is planned to increase from 98 people to approximately 410 by 2030.
The expansion comes as Hyundai Wia’s thermal-management business is already growing rapidly.
Second-quarter 2026 consolidated revenue reached KRW 2.354 trillion, up 8.0% year over year.
Operating profit was KRW 50.4 billion, down 10.6%, leaving an operating margin of 2.1%.
Automotive-parts revenue reached KRW 2.180 trillion, up 8.6%, but automotive-parts operating profit declined 33.4% to KRW 33.1 billion. Segment operating margin fell to 1.5%.
Thermal-management sales increased 305.1% year over year, supported by higher HVAC volumes.
The company does not separately disclose the absolute thermal-management revenue figure, so the growth rate should not be interpreted as evidence that the business is already large enough to reshape consolidated earnings.
Why It Matters
Electrification changes the role of thermal management inside a vehicle.
An internal-combustion engine generates substantial waste heat that can be reused for cabin heating.
An EV has a different thermal architecture.
The battery must remain within an efficient temperature range. The electric motor, inverter and other power electronics require cooling. Cabin heating draws directly on stored electrical energy.
As a result, thermal efficiency can affect driving range, charging performance, battery durability and passenger comfort.
The industry is therefore moving from separately managed cooling and air-conditioning components toward increasingly integrated thermal architectures.
Hyundai Wia is positioning itself around that shift.
Its portfolio now includes coolant modules, refrigerant modules, integrated coolant-refrigerant modules, HVAC systems, e-compressors and electronic controllers.
The company’s integrated module links coolant and refrigerant circuits and manages thermal flows across the battery, drive motor, electrical components and cabin.
This creates the potential for higher component content per vehicle than supplying an individual mechanical component.
The Slovakia plant adds another strategic layer.
Thermal-management systems are integrated closely with individual vehicle platforms. Local European manufacturing can shorten logistics chains and place Hyundai Wia closer to regional vehicle production.
But production capacity is not the same as customer demand.
And revenue growth is not the same as profitable growth.
The investment case ultimately depends on whether localization leads to higher volumes, greater content per vehicle and stronger margins.
The Slovakia plant matters because it represents commercialization rather than another technology announcement.
Hyundai Wia has been developing thermal-management products for several years.
Its coolant hub module entered mass production in 2023.
The company entered the automotive HVAC market in 2025, including production for Kia’s PV5.
It is now expanding toward more integrated coolant-refrigerant architectures and a broader set of thermal-management components.
Slovakia extends that transition into Europe.
But the financial evidence remains incomplete.
Thermal-management sales grew more than fourfold year over year in the second quarter, yet automotive-parts operating margin fell to 1.5%.
That does not mean thermal management caused the margin weakness. Product mix, legacy drivetrain volumes, regional engine operations and upfront investment also affected profitability.
But it does show that new-business growth has not yet been large enough to transform the group’s economics.
The next proof is therefore not another product launch.
It is profitable scale.