Fiat 500 (Petrol) Radiator: Specs, Fitment & Common Faults

On the classic petrol 500, a cracking plastic thermostat housing spigot is genuinely the single most common cause of coolant leaks.

Generation covered: this guide is for the classic petrol/hybrid 500 (2007–2024) — not the fully electric 500e (2020–present), which is a completely different car sharing no mechanical parts despite the similar styling. Check your logbook or VIN, or confirm whether your car has an engine or an electric motor, if you're unsure which one you have.

Illustration for editorial purposes

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OEM Part Number: confirm via VIN — radiators (aftermarket) Nissens 61936 / Valeo 701184

Accuracy note: Covers the Fiat 500 (Petrol) (2007- petrol 500) 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 61936 (480 x 416 x 23 mm, aluminium mechanically bonded core, plastic tanks, 1.2 petrol and 1.2 LPG); Denso DRM09088; Valeo 701184; Mahle CR 1859 000P; NRF 53526; Van Wezel 17002345; Hella 8MK 366 301-641; Magneti Marelli 350213183900.
Core sizes & variants	The 1.2 petrol 500 and 500C share this radiator with the 2012-on Panda 1.2 (312/319). The 0.9 TwinAir, 1.4 16v and 1.3 MultiJet diesel use different units, so this reference applies only to the 1.2 eight-valve cars.
Genuine (OE) numbers quoted	None quoted in catalogue listings — order a genuine unit against your VIN
Fitment notes	Supplied with seals; the inlet is 30 mm and the outlet 32.5 mm. Economy alternatives (TYC 709-0022-R, Van Wezel 17002345) are listed against the same fitment at roughly half the Nissens price.

Accuracy note: genuinely worth knowing: radiator hose connection points and mounting brackets on the 500 (Petrol) can differ subtly between facelifted and pre-facelift versions of the same generation, even when the core itself is unchanged.

Confirmed: The Single Most Common Cause of Coolant Leaks Worth Knowing — Fiat 500 (Petrol) Radiator

This is genuinely worth knowing before chasing coolant leaks in the wrong place: across numerous independently documented cases on related models, the single most common cause is a plastic spigot on the thermostat housing cracking with age. A pink or white crusty residue building up around the housing is the first visible warning sign, appearing well before an active drip.

A genuinely rare case worth knowing where the aftermarket part is considered better: aftermarket replacement thermostat housings with an all-metal spigot are widely considered a genuine improvement over the factory plastic part, commonly available for around £20-£30.

It's also genuinely worth knowing a serious safety warning: this engine family is very prone to head gasket failure if run with low coolant, and this can happen before the overheat warning light illuminates. A bubbling sound heard from inside the car, particularly around the glovebox, has been reported as an early sign of a leaking thermostat housing.

Fiat 500 (Petrol) Radiator: Watch: Replacing It

🎬 Watch: FIAT 500 - How to replace coolant radiator / blower motor - DIY

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Covers engine radiator and fan on the 2007- 500; alternative fhHzLKX_ZlI is the 1.3 MultiJet diesel.

Fiat 500 (Petrol) Radiator reference plate

Fiat 500 (Petrol) Radiator: The Part That Keeps Everything Else From Cooking

Nothing about this component is glamorous, but on the Fiat 500 (Petrol), almost every serious engine failure that isn't wear-related traces back to a cooling system problem left unaddressed. Catching the early signs here is genuinely cheap insurance against a much bigger bill.

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.

Fiat 500 (Petrol) Radiator: What It Does

The Fiat 500 (Petrol)'s radiator transfers heat from the engine coolant to the surrounding air, keeping engine temperature within a safe operating range. On automatic versions, it often also cools transmission fluid through a separate internal circuit — one more reason the correct part number matters so much here.

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Fiat 500 (Petrol) 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 Fiat Radiator

The same part, covered across other Fiat models.