Top 10 Automotive Radiator Suppliers in Thailand for Importers

Thailand’s radiator market includes established local manufacturers, custom copper-brass and aluminum specialists, parts distributors, and global OE heat-exchanger operations. Importers need different supply routes for catalogue replacements, custom cores and engineered OE programmes. These ten options are an unranked sourcing shortlist, not a market-share, quality or sales ranking. Qualify the exact radiator and commercial channel before approving a supplier.

A factory producing an OE radiator does not automatically offer that part to independent importers. Confirm whether the quotation covers open aftermarket stock, made-to-order production, a service part or an engineering project. Identify the contracting entity, manufacturing site, warranty issuer and permitted export channel before a sample order or payment. Climate alone does not prove that a radiator is “tropical duty.” Heat rejection, pressure integrity, corrosion, vibration, fan/shroud fit, coolant chemistry, and vehicle-specific data must be demonstrated.

Thailand’s vehicle parc makes Japanese passenger and pickup coverage important, but every radiator still needs exact engine and transmission matching.

Supplier qualification criteria

• documented automotive radiator, core, or heat-exchanger relevance;

• clear role as manufacturer, custom/repair specialist, OE supplier, or distributor;

• Thai factory or credible local-market presence;

• vehicle/application, OE reference, dimensions, materials, and product-image evidence;

• testing, quality system, traceability, corrosion/vibration, and packaging evidence;

• ability to support importer quantities, samples, documentation, and export communication.

A company registration or trade profile does not establish part-level fitment or production quality. Verify the legal entity, factory, product range, testing, certificates and commercial terms separately. For a structured audit, use Elecdura’s radiator supplier checklist.

Ten-supplier comparison (unranked)

S.L. Radiator

S.L. Radiator Company Limited states that it manufactures automotive radiators, intercoolers and auto parts at a factory in Samut Sakhon and has served Thailand and export markets for decades. Its Thai product site separates aluminum radiators, copper radiators and intercoolers, giving importers a clear starting point.

For a catalogue-based import programme, separate the requested vehicle references from custom production and confirm the manufacturing route for each part. Buyers should request the live application catalogue, OE cross-reference, core/overall dimensions, transmission-oil-cooler variants, tank and gasket material, leak-test specification, corrosion control, traceability and package validation. Verify whether private label, exclusive territories or data feeds are available.

Best fit: importers seeking an established Thai automotive radiator producer. Audit focus: model coverage, current capacity, test controls, source of tanks/cores and export packaging.

Thai Charoen Radiator

Thai Charoen Radiator describes more than three decades of manufacturing and distribution, with copper and aluminum radiators for passenger cars, light commercial vehicles, trucks, buses, agriculture, forklifts and construction equipment. It also publishes custom radiator-core capability and applications for major Japanese and global vehicle brands.

This breadth is attractive for mixed import programmes. The buyer should separate catalogue replacements from made-to-order work and confirm whether each aluminum/plastic, all-aluminum, or copper-brass unit is produced in-house. Request part-level data, controlled drawings, materials, brazing/crimping, pressure/leak tests, fin protection, warranty and export references.

Best fit: buyers needing mixed passenger, pickup and heavy-equipment coverage or custom cores. Audit focus: product segmentation, data completeness, repeatability and testing.

Chonprasit Group

Chonprasit Group presents itself as a Thai manufacturer, custom fabricator and repair specialist for car, truck and engine radiators, oil coolers and intercoolers. It documents copper-brass core production, aluminum heat-exchanger capability through its group, leak testing, core replacement and made-to-order work for domestic and Asian aftermarket customers.

Its strength is flexibility, especially for legacy, industrial, truck, generator and non-standard units. Importers must define the commercial product: entirely new radiator, new core with reused tanks, repaired unit, or service exchange. For repeat orders, convert the approved sample into a drawing/BOM with materials, tank/port source, pressure test, finish and serialized revision.

Best fit: custom, obsolete, repairable and lower-volume heat exchangers. Audit focus: new-versus-repaired status, drawing control, capacity and consistent batch production.

Union Cooler Radiator

Union Cooler Radiator identifies itself as a Thai OEM and aftermarket manufacturer of automotive and engine radiators and oil coolers. Its published scope includes cars, trucks, motorcycles, tractors, agricultural vehicles, marine engines, industrial equipment, generators, special sizes and made-to-drawing components.

The breadth and explicit OEM/aftermarket statement make it a strong development candidate. Before approval, request an English corporate profile, current application catalogue, factory and process flow, capacity, legal/quality certificates, leak and pressure-test work instructions, material control, traceability, export customer references, packaging and MOQ/lead time.

Best fit: importers seeking mixed radiator/oil-cooler categories and custom work. Audit focus: exact automotive range, documented quality controls and export communication.

T.RAD (Thailand)

T.RAD’s corporate network includes T.RAD (Thailand), placing a Thai operation within a global automotive heat-exchanger group. T.RAD’s wider business serves automotive and off-highway thermal systems, which makes the company relevant to OE-oriented buyers and engineered programmes.

The key question is commercial access. An OE plant may not sell low-volume aftermarket radiators or provide open private-label supply. Contact the Thai entity with the vehicle programme, volume, technical specification and lifecycle expectation. Confirm whether the requested radiator is available as an aftermarket/service part, an OEM programme, or a new engineering project.

Best fit: OEM/Tier-oriented programmes and engineered heat exchangers. Audit focus: accessible product route, MOQ, development cost, validation and service-part commitment.

Thai Radiator Manufacturing

Thai Radiator Manufacturing Co., Ltd. has an automotive radiator entry in the Thai Department of International Trade Promotion export directory. The profile identifies radiators and aluminium-cored products. This is a route for a sourcing enquiry, not confirmation that every requested model, production specification or destination is supported.

Before contracting, obtain the current catalogue, legal company details, quotation issuer, manufacturing address and export terms. Ask the supplier to match a defined group of OE references and return drawings and labelled sample photographs. Separate the evidence for the company from the evidence for each radiator: a company profile cannot establish hose-port position, transmission-cooler configuration or thermal performance.

Best fit: buyers able to qualify a Thai radiator source directly. Audit focus: current product availability, sample identity, test documentation and contractual responsibility.

Radicon

Radicon offers radiators alongside battery coolers, charge-air coolers, other heat exchangers and modules. Its application categories include high-performance EVs, supercars, powersports and heavy-duty/off-highway equipment. The Thai heat-exchanger business uses radicon.co.th; buyers should not confuse it with similarly named industrial-transmission businesses.

For a radiator enquiry, specify the vehicle or engine, required heat rejection, coolant, pressure, installation envelope, fan arrangement and service access. A supplier with module capability may be appropriate for an engineered assembly, but that does not establish an open replacement catalogue for ordinary passenger cars. Request a written distinction between an existing product, a modified assembly and a new development project, including validation and tooling responsibilities.

Best fit: specialist vehicle and engineered cooling programmes. Audit focus: application-specific performance, interface drawings, development scope and continuing service support.

DENSO (Thailand)

DENSO (Thailand) manufactures automotive thermal components, including radiators, condensers and intercoolers, at its Wellgrow plant in Chachoengsao. This establishes a Thai radiator-manufacturing route within the DENSO group, rather than merely a local reseller using the brand name.

Importers should route a quotation to the appropriate OE or aftermarket sales channel and identify the requested part number and destination. Do not assume a factory sells low-volume private-label replacements, that every Thai-market vehicle radiator is available from it, or that a DENSO-branded item was manufactured at this particular plant. Match the invoice issuer, product label, part number and warranty terms to the agreed supply channel.

Best fit: buyers needing an identified DENSO product or an OE-oriented programme. Audit focus: accessible sales route, genuine product traceability, exact application and warranty responsibility.

Siam Calsonic

Siam Calsonic, within Siam Motors Group, manufactures radiators and intercoolers in Thailand. Its own product presentation distinguishes high-temperature and low-temperature radiators, as well as condensers and fan-shroud assemblies. These product categories are different thermal duties, not interchangeable catalogue descriptions.

For a vehicle programme, define which coolant circuit the radiator serves, the installation geometry, heat-rejection requirement, coolant flow, pressure and fan/stack boundary conditions. For a replacement programme, request the exact service-part route and application data before treating manufacturing capability as wholesale availability. Agree the ownership of tooling, drawings and validation records for any engineered variant, together with minimum volume and service-life support.

Best fit: engineered vehicle cooling and OE-oriented enquiries. Audit focus: commercial access, circuit identity, controlled specifications and programme-scale commitments.

Air Radiators / Adrad

Air Radiators, part of Adrad Group, supplies engineered cooling solutions for heavy trucks and other demanding applications and has a location in Rayong, Thailand. Adrad's OE business manufactures customer-specific heat-transfer solutions in Australia and Thailand. This option is most relevant to heavy-vehicle or specialist mobile equipment programmes, not a presumed Thai warehouse of passenger-car replacement radiators.

Provide the engine heat load, duty cycle, ambient range, coolant and fan conditions, envelope, vibration requirements and maintenance access. Establish the production site and scope for the quoted assembly: the group's aftermarket operations and its engineered OE operations serve different commercial needs. An importer seeking a ready-made passenger-car reference should obtain explicit catalogue and availability confirmation before comparing this route with a standard replacement supplier.

Best fit: heavy-vehicle and custom thermal programmes. Audit focus: engineering scope, production allocation, validation, spare-core support and lifecycle service.

How to match Thailand’s high-volume vehicle applications

Thailand’s passenger and pickup market contains many Toyota, Isuzu, Honda, Mitsubishi, Nissan, Mazda, Ford and other Japanese/global applications. One model name can span multiple engines, transmissions, production dates and regional specifications. Confirm VIN/chassis or frame range, engine code, automatic/manual transmission, turbo/intercooler configuration, A/C and towing packages, filler neck or remote reservoir, sensor and drain, fan/shroud mounts, and integrated transmission-oil cooler.

A radiator with the right face size can still have the wrong thickness, port angle, hose diameter, bracket height, oil-cooler fittings or fan clearance. Use OE references and a verified application catalogue first, then confirm dimensions and photographs. Elecdura’s Toyota radiator range illustrates the importance of model-specific data rather than a brand-only request.

Vehicle, engine and transmission data must agree with the physical radiator interfaces.

What “tropical duty” should mean in evidence

Do not accept “for hot climate” as a complete specification. Request heat-rejection or application validation at defined coolant/air flows and temperatures, fan/shroud/stack condition, pressure and cap rating, coolant compatibility, corrosion test, vibration/thermal cycle, tank and gasket material, tube/fin/header construction, and field evidence from the relevant duty.

High ambient often coincides with idle traffic, high A/C condenser load and electrical-fan dependence. A radiator that performs at road speed may struggle when the fan, shroud or seals are weak. Dust, insects and coastal salt add different stresses. Specify the actual operating region, duty cycle, idle time, load, altitude, coolant maintenance and cleaning practice.

Factory and sample audit checklist

1. Verify legal company, factory and role for the quoted brand.

2. Trace ten target OE references through catalogue, drawing, BOM, production and test record.

3. Review tube, fin, header, tank, gasket and integrated cooler specifications.

4. Observe incoming inspection, brazing/welding/crimping, cleaning and final assembly.

5. Review leak-test medium, pressure, dwell, limits, calibration and record retention.

6. Check dimensional fixtures for mounts, ports, core and shroud interface.

7. Inspect corrosion, pressure/thermal cycle and vibration evidence appropriate to the product.

8. Confirm lot/serial traceability and change notification.

9. Validate carton support, fin and port protection, stacking and export vibration.

10. Agree sample, claim, corrective-action, data-feed and service continuity rules.

Plan the import programme, not only the first shipment

A first order may contain the easiest high-volume references, while the commercial value of the supplier appears later in its fill rate, supersession discipline and ability to support slow movers. Ask each candidate to run the same target list—preferably several hundred OE references from the buyer’s real sales history—and return matched, unmatched and ambiguous records. Review ambiguous crosses manually. A supplier that claims 100% coverage without asking about engine, transmission or production splits may be creating future returns.

Agree forecast and replenishment rules. Record minimum order by part number and by shipment, carton quantity, mixed-pallet terms, standard lead time, capacity during seasonal demand, safety stock, backorder communication and discontinued-reference notice. For private label, define artwork approval, EAN or buyer SKU, country-of-origin marking, installation/warranty insert, batch code and photo/data ownership.

Run a landed-cost model that includes inspection, inland freight, export packing, documentation, ocean or air freight, duties, inventory carrying cost, local warranty handling and damage rate. A lower factory price can be more expensive if brackets bend in transit or product data creates high returns. After launch, track claims per thousand units by supplier, part number, failure location, vehicle and lot. Share evidence quickly and require containment plus corrective action for repeated patterns.

Keep the approved sample and current drawing accessible at the receiving warehouse. When a carton, label, tank, core, bracket or port changes, compare the new shipment before it enters saleable inventory and obtain written confirmation of the revision.

Leak integrity, corrosion resistance, fitment, and shipping protection require separate evidence.

Make the first receiving inspection a reusable baseline

For the first imported lot, retain a dated receiving record for each approved application. Photograph the unopened carton, internal supports, radiator label, hose connections and mounting points before releasing the part to saleable inventory. Link the record to the purchase order and the approved sample revision, not merely to the supplier's catalogue description.

Record a packaging defect separately from a fitment discrepancy or a confirmed leak. Otherwise the supplier and importer may discuss different problems under one return code. Share the evidence format with the receiving warehouse before the shipment arrives, and agree which discrepancies require quarantine rather than relabelling or local modification. The same record then supports consistent comparison of later deliveries.

RFQ checklist

• vehicle make/model, VIN/chassis range, model year and engine code;

• manual/automatic transmission and integrated cooler details;

• complete OE number and existing radiator label;

• core and overall dimensions, mounts, filler/degas, drain/sensor;

• inlet/outlet diameter, angle and location with photographs;

• fan/shroud, condenser and stack relationship;

• coolant, pressure, ambient, idle/load, corrosion and dust duty;

• new catalogue, custom or repair/recore requirement;

• sample and annual quantity, destination and Incoterm;

• private label, data, test, warranty, packaging and delivery requirements.

Frequently asked questions

Are all ten companies confirmed export-ready manufacturers?

No. Manufacturing capability, a trade-directory entry and export readiness are separate checks. Confirm the exact radiator, accessible sales channel, sample quality, contracting entity and destination-specific terms. Custom and OE programmes also require a clear development and validation agreement.

Is a Thai-made radiator automatically suited to high ambient?

No. Country of manufacture does not prove thermal capacity or durability. Evaluate the exact radiator and installed fan/stack against defined duty and application data.

Should importers choose aluminum or copper-brass?

Choose from vehicle design, heat rejection, weight, pressure, vibration, corrosion, repairability and lifecycle cost. Both materials can perform well when correctly engineered and manufactured.

Can an importer buy from a Thai repair/custom shop?

Yes, particularly for obsolete or special radiators, but the contract must state new, repaired, recored or reused content. Bulk repeatability requires controlled drawings, materials, tests and traceability.

How can Elecdura support a Thailand-focused programme?

Elecdura’s wholesale radiator service can review OE references, fitment evidence, samples, quality controls and export packaging for distributors serving Thailand or sourcing globally.

Use the list to investigate, then qualify the actual part

Thailand provides several radiator supply routes: catalogue manufacturers, custom and repair specialists, global OE operations and engineered heavy-vehicle cooling suppliers. Their commercial purposes differ. Start with the supplier role, demand primary evidence, then approve the exact application through data, drawing, sample, testing, packaging and change control.

For an Elecdura comparison, send the OE number, vehicle/engine/transmission, radiator and port photographs, complete dimensions, operating duty, sample and annual volume, destination, required data and warranty terms. A disciplined evidence pack turns a broad supplier list into a reliable radiator programme.