Coolant circulates through the engine block absorbing heat, then passes into the radiator where thin aluminium or brass fins dissipate that heat into the airstream flowing through the front of the car. Without an efficient radiator, engine temperature climbs beyond safe operating limits within minutes, causing head gasket failure, warped cylinder heads, or in serious cases a seized block. Most radiators on European cars are rated to last 150,000 miles under normal conditions, but corrosion from old coolant, stone damage to the core, and cracked plastic end tanks are the most common reasons for earlier replacement. The first warning is usually a rising temperature gauge, a sweet smell from the engine bay, or coolant pooling under the parked car. When fitting a replacement, the OE reference is critical: it encodes the exact core dimensions, inlet and outlet pipe positions, coolant capacity, and transmission-cooler provision that match your specific engine configuration. Valeo and AKS Dasis are among the established names supplying original-equipment radiators for the majority of European platforms, and their replacement units carry identical dimensional tolerances to ensure a straightforward swap without bracket modification.
Each radiator listed here is linked to specific vehicle chassis through the TecDoc OE reference. The OE number encodes core width, height, and depth, the number and position of coolant connections, and whether the unit includes provisions for an automatic transmission cooler. Cross-check the number on your existing radiator — usually stamped on a small metal tag near the filler neck — against the listings here, and verify using your VIN or make-model-year selector to confirm the exact chassis variant.
OEM radiators are produced to the vehicle manufacturer's original specifications, typically by tier-one suppliers such as Valeo or Denso, and carry the stamped OE number. Quality aftermarket radiators from established names match those dimensions and flow ratings but may use slightly different alloy compositions or manufacturing tolerances. Budget aftermarket units can suffer from weaker plastic end tanks and thinner core tubes, which shorten their service life, particularly in climates with hard water or aggressive road salting.
Plastic end tank repair kits are available for some models, but they are a temporary measure. The plastic used in radiator end tanks becomes brittle with repeated heat cycling, and a crack in one location often indicates that the material throughout the tank is fatigued. A complete radiator replacement with an OE-matched unit is more cost-effective in the long run, because it restores the original pressure rating and eliminates the risk of a second failure at a different location within months of the repair.
The most obvious symptom is coolant loss — either a visible puddle of green or orange liquid beneath the car or a reservoir level that drops without explanation. A sweet smell through the ventilation system suggests coolant vapour entering the cabin, which points to a leak near the heater matrix or radiator neck. Persistent overheating after a coolant flush and thermostat check, discolouration around the end-tank joints, or a pinhole in the core visible after cleaning are all reliable indicators that the radiator itself is the problem.
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