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.
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Toyota Aygo Radiator: OEM Part Number
| Manual gearbox, all engines | Standard radiator with no transmission cooling circuit |
|---|---|
| Automatic/CVT | Transmission oil cooler built into the radiator's tank as an internal circuit on most conventional automatics, or (on CVT/hybrid variants) via a genuinely different arrangement — confirm your exact transmission type before ordering, since fitting the wrong version omits necessary cooling |
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.
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: 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.