Southeast Asia’s automotive industry has undergone significant structural change in recent years. Internal combustion engine (ICE) vehicles continue to represent a substantial installed base, while electric vehicles (EVs) are gaining market share and automotive manufacturing and component supply chains are becoming increasingly regionalized and localized. At the same time, differences in vehicle parc, powertrain mix, industrial policy, and market development are becoming more pronounced across individual countries.
For the automotive aftermarket, this means the region is moving beyond a market defined primarily by new vehicle growth. Replacement demand from the existing vehicle parc and broader structural changes in the automotive industry are now developing in parallel.
01 | The Existing ICE Vehicle Parc Remains a Key Foundation for the Aftermarket
Despite the rapid growth of electric vehicles, conventional ICE vehicles continue to account for a substantial share of the Southeast Asian vehicle parc.
Countries including Indonesia, Thailand, Malaysia, and Vietnam have established automotive manufacturing industries and large vehicle populations. A significant number of vehicles already in operation will continue to enter maintenance, repair, and replacement cycles, providing an important foundation for the traditional automotive aftermarket over the coming years.
This is also raising the requirements placed on automotive parts supply chains.
For aftermarket buyers, the question is increasingly about more than product availability. Accurate vehicle and application coverage, consistent product quality, supply continuity, and the ability to respond efficiently to different market requirements are becoming increasingly important.
For cooling systems, air-conditioning systems, and engine-related components, the continued operation of the existing vehicle parc will remain an important source of aftermarket demand.
02 | EV Growth Is Driving a Structural Shift in Aftermarket Demand
Electric vehicles are becoming an increasingly important driver of change in Southeast Asia’s automotive market.
According to the International Energy Agency (IEA) in its Global EV Outlook 2026, electric car sales in Southeast Asia more than doubled year on year in 2025, reaching more than 500,000 units. Electric cars accounted for close to one in five new cars sold in the region, with Vietnam, Indonesia, and Thailand among the leading markets for regional growth.
From an aftermarket perspective, however, the growth of EVs does not mean that demand for conventional automotive components will disappear in the near term.
Southeast Asia is currently experiencing the coexistence of different powertrain technologies. Conventional vehicles continue to represent a large installed base, while the number of EVs in operation is increasing. This creates two overlapping areas of aftermarket demand:
Ongoing maintenance and replacement demand from conventional vehicles, alongside emerging component requirements associated with electrified vehicles.
The transition is also changing the technical scope of automotive thermal management. Batteries, electric drive systems, power electronics, heat pumps, and other electrified vehicle systems introduce additional thermal management requirements. As the installed base of these vehicles expands, related aftermarket applications are likely to develop progressively.
03 | Automotive Supply Chains Are Becoming More Regional and Localized
The growth of EV manufacturing is also reshaping automotive supply chains across Southeast Asia.
Thailand has long maintained an important position as an automotive manufacturing hub and is strengthening its role in EV production and related component development. Indonesia is likewise promoting greater localization of EV manufacturing and strengthening its automotive supply chain capabilities.
As a result, Southeast Asia is developing beyond its role as an automotive consumption market into an increasingly important regional hub integrating vehicle manufacturing, component production, regional trade, and industrial investment.
This evolution is also changing how automotive parts suppliers compete.
For regional buyers, supplier value is no longer determined by price alone. Stable manufacturing capabilities, consistent supply, broad product coverage, and an understanding of individual national market requirements are becoming increasingly important considerations.
For aftermarket businesses operating across multiple Southeast Asian markets, the ability to support different vehicle populations, product requirements, regulatory environments, and supply-chain conditions can therefore become an important part of supplier selection.
04 | Climate and Operating Conditions Keep Thermal Management in Focus
Most Southeast Asian countries are located in tropical or subtropical environments, where high temperatures, humidity, and heavy rainfall are recurring operating conditions.
The World Meteorological Organization (WMO), in its State of the Climate in Asia 2025, reported that Asia experienced dangerous heat, heavy rainfall, flooding, drought, and other extreme weather events in 2025, with significant human and economic impacts. The report also highlighted exceptional rainfall and flooding in parts of Southeast Asia.
For the automotive industry, climate conditions should not be directly interpreted as evidence of increased demand for any specific component category. However, prolonged exposure to heat and humidity, combined with demanding road and operating conditions, places continuing requirements on vehicle cooling, air-conditioning, and thermal management systems.
At the same time, the transition toward electrified vehicles is expanding the scope of thermal management beyond conventional engine cooling and air-conditioning systems to include battery, electric drive, and power-electronics thermal management.
As a result, thermal management is becoming an important technical area connecting conventional vehicles with the next generation of electrified vehicles.
For automotive thermal-management suppliers, this creates a market environment in which established aftermarket applications and emerging electrification-related requirements are developing alongside each other.
05 | From the “Southeast Asian Market” to Individual National Markets
Based on these developments, three trends are becoming increasingly evident across Southeast Asia’s automotive aftermarket.
First, the existing vehicle parc remains important.
Conventional vehicles represent a substantial installed base, and maintenance, repair, and replacement demand will continue to support the traditional aftermarket for an extended period.
Second, EV growth is reshaping the market structure.
Electric vehicle sales are growing rapidly, but the pace and scale of adoption vary significantly from country to country. Conventional powertrains and electrified vehicles are therefore likely to coexist for an extended period. IEA data shows strong regional growth while also highlighting substantial differences between individual Southeast Asian markets.
Third, supply chains are placing greater emphasis on localization.
As Southeast Asia’s automotive manufacturing industry continues to develop, competition is gradually expanding beyond products themselves to include manufacturing capabilities, supply reliability, product coverage, and regional service capabilities.
Taken together, these trends mean that Southeast Asia’s automotive aftermarket will increasingly be difficult to characterize as a single, uniform market. Understanding each country’s vehicle parc, powertrain mix, industrial policies, and aftermarket requirements will be an important foundation for companies seeking to deepen their presence in the region.
As a manufacturer specializing in automotive thermal management, Jiangxi Xintian Auto Industry Co., Ltd. continues to monitor developments across Southeast Asia’s automotive industry and aftermarket. The company is refining its product portfolio and market support capabilities in response to the characteristics and requirements of individual markets.
Southeast Asia’s automotive aftermarket is not undergoing a simple replacement of the traditional market. Rather, it is experiencing a structural transition driven by the continued development of the existing vehicle parc, the growth of electric vehicles, and the restructuring of regional automotive supply chains.
For automotive aftermarket participants, the key consideration is therefore not simply how fast the market will grow, but how vehicle parc composition, powertrain demand, product requirements, and supply-chain relationships will evolve across individual markets.
References and Data Sources
- International Energy Agency (IEA), Global EV Outlook 2026
- World Meteorological Organization (WMO), State of the Climate in Asia 2025
- ASEAN Automotive Federation (AAF)
- GAIKINDO (Indonesian Automotive Industry Association)
- Federation of Thai Industries (FTI)
- Malaysian Automotive Association (MAA)
- Vietnam Automobile Manufacturers’ Association (VAMA)
Data and methodology note:
This article is based on publicly available industry reports, statistical data, and institutional publications available as of August 2026. Statistical definitions, methodologies, and publication schedules may differ between sources and markets, particularly for vehicle parc, vehicle age structure, and electrification-related indicators.
The analysis represents an industry-level assessment based on publicly available information and does not constitute a definitive forecast of future market developments. It is intended as a reference for automotive aftermarket professionals and should not be regarded as the sole basis for procurement or commercial decisions.
📍 Jiangxi Xintian Auto Industry Co., Ltd.
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