Toyota Yaris Radiator: Specs, Fitment & Common Faults

On the Yaris, a genuinely useful diagnostic pattern: coolant loss specifically at higher speeds points toward a pressure or cap issue.

Illustration for editorial purposes

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OEM Part Number: 16400-0Y060 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 646868 / Valeo 701177

Accuracy note: Covers the Toyota Yaris (XP130 2011-2020) 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 646868; Denso DRM50086; Ava TO2663; Magneti Marelli 350213208400; Prasco TY020R004. For the 1.5 Hybrid: Nissens 646873 (600 x 404 x 16 mm, aluminium with plastic tanks, automatic/e-CVT); Valeo 701177; Denso DRM50089; NRF 58382
Core sizes & variants	The 1.33 petrol Yaris uses a small 350 x 478 mm radiator shared with the Verso-S and Subaru Trezia; the Hybrid has a much wider 600 x 404 mm core because its engine and inverter cooling share the front frame.
Genuine (OE) numbers quoted	16400-0Y060; 16400-47090; 16400-47100; 16400-47141 (1.33); 16400-21330; 16400-21331 (Hybrid)
Fitment notes	The 1.33 radiator has 31 mm connections and is supplied without a cap; the Hybrid unit has 31.5 mm connections. Multimode automatic 1.33 cars with an oil cooler need a different variant.

Accuracy note: genuinely worth knowing: Toyota sometimes fits a heavier-duty radiator as standard on Yaris trims with towing packs or higher-accessory-load options — worth confirming your exact spec rather than assuming the base-model rating applies.

A Genuinely Useful Diagnostic Pattern Worth Knowing About — Toyota Yaris Radiator

If you're losing coolant specifically through the overflow or header tank pipe, and it seems to happen only at higher speeds, this is genuinely worth understanding: this specific pattern points toward excessive pressure building up in the cooling system, rather than a head gasket issue, particularly if a proper block test has already ruled the head gasket out. A radiator cap that's no longer holding pressure correctly, or a partial blockage somewhere in the system, are both worth checking.

A genuinely useful technical explanation worth knowing about water pump noise: a whining or grinding noise from the water pump area is typically caused by bearing wear, and in more advanced cases, the impeller itself striking the housing once the bearing has failed enough to let it shift position.

It's also worth knowing that coolant leaking specifically from the water pump's shaft seal, visible as a small weep beneath the pump, is often one of the earliest signs of pump failure.

Toyota Yaris Radiator: The Part That Keeps Everything Else From Cooking

This isn't a part anyone gets excited about, but on the Toyota Yaris, overlooked cooling problems are responsible for most serious engine failures that aren't simple wear-and-tear. Catching the early symptoms is about the cheapest insurance available against a major bill later.

Toyota Yaris Radiator: Watch: Replacing It

🎬 Watch: Toyota Yaris Cooling System Overhaul: Radiator, Water Pump & Thermostat

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Generation not stated in title; XE1SbehKHfM is a confirmed older-gen T3 fallback

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.

Toyota Yaris Radiator: What It Does

Keeping the Toyota Yaris's engine temperature within safe limits comes down to the radiator's job of transferring heat from the coolant into the surrounding air. Automatic-gearbox versions often build in a second circuit for transmission fluid cooling too, which is exactly why fitting the wrong part number can cause two problems, not one.

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Toyota Yaris 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 Toyota Radiator

The same part, covered across other Toyota models.