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This guide collects the specification and buying detail behind our cooling system catalogue. For wholesale quotations, browse the catalogue, send part numbers through a parts list upload or request product sourcing for items that are not listed online.
What this category covers
- Heat exchangers: radiators, intercoolers and A/C condensers.
- Circulation: water pumps, thermostats and housings.
- Pressure control: radiator caps and expansion tanks.
- Airflow: electric fan motors, mechanical fan blades and viscous fan clutches.
- Hoses: radiator hoses and heater hoses, molded to shape.
How pickup and truck cooling systems differ
Most Japanese pickups with longitudinal engines, including the Toyota Hilux and Isuzu D-Max, use an engine-driven fan with a viscous clutch mounted on the water pump or a dedicated fan bracket, plus a radiator with an integrated automatic transmission oil cooler on automatic versions. Transverse-engine vans and SUVs usually rely on electric fans. Turbo-diesel engines add an intercooler, either top-mounted under a hood scoop or front-mounted ahead of the radiator. Trucks such as the Hino 500 use large-capacity radiators, often in copper-brass or aluminum with bolted or crimped tanks, and fan clutches sized for high airflow.
Materials and construction
Radiators come in two main construction families. Aluminum cores with plastic tanks are lighter and standard on most modern vehicles; the crimped tank seal and plastic tank neck are common failure points under heat cycling. Copper-brass radiators are heavier but repairable by local radiator shops, which keeps them in demand in some markets and truck applications. Core thickness, number of rows, fin density and tube design determine cooling capacity.
Common failure drivers
- Coolant neglect: plain water or mixed coolant types causing scale and corrosion
- Dust and insects blocking fins, especially with bull bars and additional lights ahead of the radiator
- Water pump seal leaks and bearing wear from belt tension and contaminated coolant
- Plastic tank cracks from thermal cycling
- Thermostats sticking closed or open
- Hose degradation from heat and oil contamination
Identification
Cooling parts depend heavily on engine, transmission (manual or automatic), air-conditioning equipment and model year. Radiators are specified by core dimensions, inlet and outlet positions and diameters, cap type, and transmission cooler provisions. Send references and photos through RFQ upload when OEM numbers are incomplete.
Cooling parts as a system
Workshops in hot markets increasingly treat an overheating complaint as a system job rather than a single-part replacement. A radiator replacement on a high-mileage pickup often brings a thermostat, cap, hoses and coolant with it, and a water pump job on a belt-driven engine often includes the fan clutch. Distributors that stock these lines in matched depth for the dominant engine families can supply the complete job and reduce the risk of a new radiator failing because an old cap or thermostat was left in place.
Buying and specification checklist
What to include in an enquiry
- OEM number, vehicle model, engine code, transmission (MT or AT) and year.
- Radiators: core width, height and thickness; inlet and outlet size and position; filler neck location; oil cooler connections for automatic transmissions; mounting points.
- Water pumps: gasket or O-ring seal, impeller type, pulley or fan flange, and whether a housing is included.
- Thermostats: opening temperature, diameter, and whether a housing or seal is supplied.
- Fan clutches: bolt pattern, rotation direction, and matching fan blade diameter.
Construction choices
Decide per market whether aluminum-plastic or copper-brass radiators suit your customers. Repair culture, climate and truck fleet mix all influence the choice. For intercoolers, confirm core type and whether aftermarket upgrades will need modified pipework.
Packaging and freight
Radiators, condensers and intercoolers are volume-heavy and fragile. Fins bend easily and tank necks break under impact. Insist on individual cartons with corner and face protection, and do not accept loose stacking. Plan them early in container load calculations because they fill space quickly. Water pumps and thermostats are dense and compact by comparison.
Quality checks on arrival
Look for bent fins, cracked tank necks, damaged O-rings and corrosion on metal parts. Pressure-testing a sample of radiators before distribution identifies leaks before they become customer claims.
Consolidation
Cooling parts combine well with belts, hoses and filters in a mixed container. Volume-heavy radiators balance dense lines such as brake discs.
Product types in detail
Radiators
Radiators transfer heat from engine coolant to the air. For pickups, vans and trucks operating in hot climates with heavy loads, radiator condition directly determines whether an engine can hold normal temperature on long climbs and in slow traffic. Browse radiators in the catalogue.
Construction types
- Aluminum core with plastic tanks – brazed aluminum tubes and fins with nylon tanks crimped onto the header plates. Standard on most modern vehicles. Tank cracks and gasket leaks at the crimp are typical failures.
- All-aluminum radiators – welded aluminum tanks, common in aftermarket upgrade and heavy-duty options.
- Copper-brass radiators – soldered copper fins and brass tubes, with brass or bolted tanks. Heavier and more expensive in material, but repairable by radiator shops. Still common on many trucks and in some aftermarket segments.
Core design
Core thickness, number of tube rows, tube width and fin density determine capacity. A thicker core does not automatically cool better if fin density restricts airflow in dusty conditions. Louvered fins improve heat transfer but clog more readily.
Transmission and accessories
Automatic transmission radiators include an oil cooler inside the outlet tank, with threaded or quick-connect fittings. Some radiators also carry mounts for fan shrouds, condenser brackets and temperature sensors.
Applications
Pickups such as the Mitsubishi Triton and Toyota Hilux use different radiators by engine, transmission and generation. Truck radiators for chassis like the Isuzu NPR are larger and often mounted with rubber isolators to absorb chassis flex.
Ordering checklist
- OEM number plus engine code, transmission type (MT/AT) and year.
- Core dimensions: width, height and thickness, and number of rows.
- Connections: inlet and outlet diameter and position (left/right, top/bottom), drain plug location, and filler neck or cap location.
- Transmission cooler: present or not; fitting thread or quick-connect type.
- Construction: aluminum-plastic, all-aluminum or copper-brass; tank material and gasket type.
- Mounting: pins, brackets, and fan shroud attachment points.
- Testing: ask whether every radiator is leak-tested before packing and what test method is used.
- Packaging: individual cartons with rigid face protection, capped inlets and outlets, and reinforced corners. Radiators are among the most damage-prone items in a parts shipment.
- Container planning: radiators use space quickly. Request carton dimensions for every reference before finalizing a mixed load, and avoid stacking dense cartons on top of them.
- Warranty handling: agree a claim procedure with suppliers before shipping. Leaks caused by transit damage and leaks caused by manufacturing defects need to be distinguished, which requires photos on arrival.
Intercoolers
An intercooler cools compressed air from the turbocharger before it enters the engine. Cooler, denser intake air improves combustion efficiency and power and reduces exhaust gas temperature, which is valuable for turbo-diesel pickups and trucks carrying loads in high ambient temperatures. Browse intercoolers in the catalogue.
Layouts
- Top-mount intercoolers – sit above the engine and receive airflow through a hood scoop. Short pipework and quick throttle response, but they absorb engine heat when the vehicle is stationary or moving slowly.
- Front-mount intercoolers – placed ahead of the radiator in the direct airflow. Better cooling at speed, but longer pipework and exposure to stone damage and water crossings.
- Truck charge air coolers – large units mounted ahead of the radiator on medium- and heavy-duty trucks.
Construction
- Tube-and-fin cores are lighter and common as original equipment.
- Bar-and-plate cores are heavier and more robust, popular for aftermarket upgrades and heavy use.
- End tanks may be cast aluminum, welded aluminum or plastic.
Failure and replacement drivers
Cracked end tanks, split tubes from stone damage, oil contamination from turbocharger seal wear, and fin clogging from mud and dust. Boost leaks cause loss of power, black smoke and higher fuel consumption.
Upgrades
Aftermarket front-mount conversion kits for pickups such as the Isuzu D-Max and Ford Ranger are a separate product segment from OE replacement intercoolers. They typically include pipework, silicone hoses, clamps and brackets and may require bumper trimming. Related parts are listed under turbocharger components.
Ordering checklist
- OEM replacement: OEM number, engine code and model year; note any hood scoop or bracket differences.
- Core and ports: core dimensions, port diameter and orientation, and mounting points.
- Construction: tube-and-fin or bar-and-plate; tank material and welding quality.
- Upgrade kits: confirm full kit contents (pipes, couplers, clamps, brackets, hardware), whether bumper modification is needed, and whether the kit suits vehicles fitted with bull bars.
- Pressure testing: ask whether units are pressure-tested and to what level.
- Regulatory check: in some markets, visible modifications to intake systems may affect vehicle inspections; importers should confirm locally.
- Packaging: intercoolers are fragile. Require face protection over the fins, capped ports, and rigid cartons. Upgrade kits with multiple components should be packed so pipes do not dent the core.
- Volume: front-mount kits are bulky; request dimensions per kit for container planning.
- Customer information: communicate clearly whether an upgrade kit retains the factory air-conditioning condenser and horn positions, since this is a common question from installers.
Water Pumps
The water pump circulates coolant through the engine, radiator and heater core. Pump failure causes rapid overheating, and a leaking seal can lose coolant slowly until damage occurs. Pumps on engines working in heat and dust carry heavy belt and fan loads, which accelerates bearing and seal wear. Browse water pumps in the catalogue.
Drive types
- Accessory-belt-driven pumps – driven by the serpentine or V-belt. On many longitudinal-engine pickups and trucks, the viscous fan clutch bolts to the pump hub, adding load to the pump bearing.
- Timing-belt-driven pumps – driven by the timing belt on some engines; usually replaced at the same time as the timing belt.
- Gear-driven pumps – found on some diesel and truck engines.
- Electric water pumps – used on some newer engines and hybrid systems.
Construction details
- Impeller: cast iron, stamped steel, aluminum or composite. Composite impellers are light and resist corrosion but can crack or slip on the shaft if poorly made.
- Mechanical seal: carbon-ceramic or silicon-carbide faces. Seal quality determines leak-free life, and coolant contamination destroys seals quickly.
- Bearing: double-row ball bearing sized for belt and fan loads.
- Mounting: gasket, O-ring or liquid sealant; pump only or pump with housing.
Applications
Diesel pickups such as the Toyota Hilux and trucks such as the Hino 500 use pumps designed for their engine family and fan arrangement. Pumps are often ordered alongside timing belt kits, thermostats and hoses.
Ordering checklist
- OEM number and engine code, since pumps vary between engine updates.
- Drive and flange: pulley type, fan clutch flange and bolt pattern, rotation direction.
- Housing: confirm whether the pump includes a housing, backing plate or thermostat seat.
- Seals: gasket or O-ring included; any required sealant noted.
- Impeller material and blade design; ask for evidence of impeller retention on composite designs.
- Quality checks: shaft play, smooth bearing rotation, seal face finish and casting porosity on samples.
- Packaging: individual boxes with flange and shaft protection. Pumps are dense, so check carton weights.
- Kits: a pump with thermostat and gasket kit simplifies workshop orders for high-volume engines.
- Coolant advice: include guidance that the system should be flushed and refilled with the correct coolant, since contamination is a leading cause of repeat pump failure.
- Stock depth: pumps for the dominant diesel pickup and light-truck engines move steadily; gasoline passenger references can be covered at lower depth.