Toyota Aygo Radiator: Specs, Fitment & Common Faults

On the Aygo, 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: 164000Q080 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606697 / Denso DRM50134

Accuracy note: Covers the Toyota Aygo (2014-2021) 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 606697 (374 x 352 x 27 mm, aluminium soldered core, plastic tanks, 1.0 1KR-FE petrol); Denso DRM50134; Van Wezel 09012701; Ava TO2764; Magneti Marelli 350213203200; AKS Dasis 210005N.
Core sizes & variants	One radiator covers every second-generation Aygo, manual or x-shift, with or without air conditioning.
Genuine (OE) numbers quoted	B000765280; 164000Q080
Fitment notes	Inlet and outlet are 28 mm.

Accuracy note: genuinely worth knowing: radiator core size and construction can differ between petrol and diesel Aygo engines, and again between manual and automatic gearboxes where the automatic needs an integrated oil cooler circuit — confirm your exact engine code and transmission before ordering.

A Genuinely Useful Diagnostic Pattern Worth Knowing About — Toyota Aygo 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 Aygo Radiator: The Part That Keeps Everything Else From Cooking

This isn't a part anyone gets excited about, but on the Toyota Aygo, 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 Aygo Radiator: Watch: Replacing It

🎬 Watch: How to replace airco pump condensor and radiator on a Toyota Aygo 2005-2014 also fit (4K) (older gen)

Watch on YouTube ↗

Mk1 Aygo; the 2014- car has the same 1KR engine and near-identical cooling pack.

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 Aygo Radiator: What It Does

Keeping the Toyota Aygo'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 Aygo 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.