Hyundai Tucson Radiator: Specs, Fitment & Common Faults

A genuinely useful diagnostic detail: a leak specifically from the weep hole near the A/C compressor points toward a failing water pump seal — plus why checking the timing belt tensioner matters even after a recent pump replacement.

Illustration for editorial purposes

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OEM Part Number: 25310D7000 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606605 / Valeo 701140

Accuracy note: Covers the Hyundai Tucson (2015-2020) as listed in the UK aftermarket catalogues. Radiators are sold by engine, gearbox and air-conditioning fitment, and one model usually has two or three different cores — a thicker core for diesels and automatics, a thinner one for small petrols — with different hose positions, so a radiator for the wrong engine will not connect up. The references below are UK aftermarket listings whose fitment lists name this generation, labelled by brand with the core size in mm; genuine numbers are those quoted against the listing. Check your engine code and whether the car has air conditioning against your VIN, and replace the coolant and bleed the system after fitting.

Radiators (aftermarket)	Nissens 606605 (485 x 467 x 26 mm, aluminium core, plastic tanks, 35 mm connections, supplied with seals, fits 1.6 CRDi D4FE, 1.7 CRDi D4FD, 2.0 CRDi D4HA and 1.6 T-GDi G4FJ including AWD and 48V versions); Valeo 701140; Denso DRM41031; NRF 550221; Mahle CR 1978 000P; Ava KA2350; Van Wezel 82012742; Magneti Marelli 350213204900. Nissens 606603 (635 x 467 x 16 mm, aluminium core, plastic tanks, 35 mm connections, fits 1.6 GDi G4FD and 2.0 petrol G4NA)
Core sizes & variants	Turbo engines (all diesels and the 1.6 T-GDi) use the 26 mm-thick 485 mm core; the normally aspirated 1.6 GDi and 2.0 petrol use a wider but thinner 635 x 16 mm core.
Genuine (OE) numbers quoted	Turbo/diesel: 25310D7000; 25310D7050. Non-turbo petrol: 25310D7500; 25310D7550
Fitment notes	The diesel radiator is sold with seals but without the expansion tank or frame

Accuracy note: genuinely worth knowing: whether a Tucson has air conditioning or a larger optional engine can change radiator sizing on some variants — fitment guides that only ask for model and year can still get this wrong, so cross-check the engine code where possible.

A Genuinely Useful Diagnostic Detail Worth Knowing — Hyundai Tucson Radiator

If you're trying to pin down exactly where a coolant leak is coming from, this is genuinely worth knowing: a leak specifically from the small weep hole in the engine block near the A/C compressor points toward a failing water pump seal rather than a more general leak from a hose or the radiator itself. This specific location is deliberately designed to show early signs of a failing pump seal before it becomes a larger problem, so finding coolant here is a fairly reliable, specific sign of what actually needs replacing.

A genuinely honest point worth knowing even after a recent water pump replacement: if a leak returns despite the water pump having been replaced relatively recently, it's worth knowing that internal seals or bearings within even a new pump can occasionally be compromised from the factory, or the pump can be damaged by an unrelated issue rather than the part itself being faulty. It's worth checking the timing belt tensioner and pulleys for wear at the same time, since improper belt tension can itself cause damage to a water pump that would otherwise have been perfectly fine.

It's also worth knowing that the thermostat housing, commonly made from plastic on many models, sits toward the front of the engine, higher up than where normal air conditioning condensation would appear — worth checking this specific area directly if you're seeing what looks like water underneath the car but aren't certain whether it's genuinely coolant or simply harmless AC condensation.

Hyundai Tucson Radiator: The Part That Keeps Everything Else From Cooking

Few parts get less attention than this one, but on the Hyundai Tucson, a neglected cooling system is behind the vast majority of avoidable serious engine failures. Noticing the early warning signs costs nothing and can save a genuinely large repair bill down the line.

Hyundai Tucson Radiator: Watch: Replacing It

🎬 Watch: Replacing a radiator on a 2013 Hyundai Tucson (older gen)

Watch on YouTube ↗

ix35/LM-generation Tucson; only hose-connector videos exist for 2015-2020 TL

Before you buy: radiator size and design vary significantly by engine size, transmission type, and whether your car has air conditioning. Always confirm against your VIN before ordering.

Hyundai Tucson Radiator: What It Does

On the Hyundai Tucson, coolant runs through the radiator to shed engine heat into the airflow, keeping temperatures in check. On many automatics, a separate internal circuit inside the same unit also cools the transmission fluid — one more reason a mismatched part number causes more than just a cooling problem.

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Hyundai Tucson Radiator: Faults, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Radiator Guide for the three common failure modes, confirming fitment against your VIN, and OEM vs aftermarket guidance.

More Hyundai Radiator

The same part, covered across other Hyundai models.