Fiat Panda Radiator: Specs, Fitment & Common Faults

Confirmed: a cracking plastic thermostat housing spigot is the single most common cause of coolant leaks — with a genuine, rare case where the aftermarket metal replacement is actually better than OEM, plus a critical safety warning about head gasket failure.

Illustration for editorial purposes

Find Fiat Panda Radiator Here!

Opens live listings in a new tab.

OEM Part Number: 51892706 (as quoted in catalogue listings — confirm via VIN) — aftermarket radiators Nissens 606159 / Valeo 735273

Accuracy note: Covers the Fiat Panda (2012-) 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 606159 (480 x 388 x 16 mm, brazed aluminium with plastic tanks, 0.9 TwinAir 60/65/86/90 hp, 0.9 4x4 and 0.9 Natural Power); Valeo 735273; Denso DRM09087; Mahle CR 2004 000S; NRF 58428; Prasco FT124R002; Kamoka 7705436. Nissens 61936 (480 x 416 x 23 mm, mechanically bonded aluminium with plastic tanks, 1.2 8v 69 hp 169 A4.000, shared with the Fiat 500); Valeo 701184
Core sizes & variants	The 0.9 TwinAir takes the thinner 16 mm brazed core (606159); the 1.2 petrol takes the 23 mm mechanically bonded core (61936) it shares with the 500.
Genuine (OE) numbers quoted	51892706; 51939066 (606159); none quoted for 61936
Fitment notes	Both have a 30 mm inlet and 32.5 mm outlet and both are supplied with gaskets and seals.

Accuracy note: genuinely worth knowing: whether a Panda 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.

Confirmed: The Single Most Common Cause of Coolant Leaks Worth Knowing — Fiat Panda Radiator

This is genuinely worth knowing before chasing coolant leaks in the wrong place: across numerous independently documented cases, the single most common cause on this engine range is a plastic spigot on the thermostat housing cracking with age and heat cycling. Genuinely worth knowing before it fails completely: a pink or white crusty residue building up around the housing and the hose connecting to it is the first visible warning sign, appearing well before an active drip or a noticeable drop in coolant level — worth checking for this specific residue proactively rather than waiting for a more obvious leak to develop.

A genuinely rare case worth knowing where the aftermarket part is considered better than the original: aftermarket replacement thermostat housings with an all-metal spigot, rather than the original plastic design, are widely considered a genuine improvement over the factory part, and are commonly available for around £20-£30 complete with a new thermostat. Given how frequently the original plastic design fails, it's genuinely worth specifically seeking out a metal-spigot replacement rather than a like-for-like plastic one when this part needs replacing.

It's also genuinely worth knowing a serious safety warning about this specific engine family: it's been described as very prone to head gasket failure if run with low coolant, and critically, this can happen before the overheat warning light illuminates, and may not even register clearly on the temperature gauge. A genuinely useful early warning sign worth listening for: a bubbling sound heard from inside the car, particularly around the glovebox area, has been reported as an early sign of a leaking thermostat housing, sometimes noticeable before any visible drop in coolant level — worth checking your coolant level promptly if you notice this specific sound, rather than waiting for a warning light that might come too late.

Fiat Panda Radiator: The Part That Keeps Everything Else From Cooking

Unglamorous as it is, the Fiat Panda's cooling system sits behind nearly every serious engine failure that isn't just ordinary wear — and one that went unaddressed for too long. Noticing early warning signs here is a small cost against a potentially very large one.

Fiat Panda Radiator: Watch: Replacing It

🎬 Watch: LEAKY RADIATOR Replacement - Fiat Panda TWINAIR

Watch on YouTube ↗

TwinAir = 2012+ (312) Panda.

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 Panda Radiator: What It Does

On the Fiat Panda, engine coolant sheds its heat into the passing air via the radiator, which is what keeps engine temperature in a safe working range. On automatics, it frequently pulls double duty cooling the transmission fluid through its own internal circuit — a detail that makes getting the exact part number right especially important.

Find Fiat Panda Radiator Here!

Opens live listings in a new tab.

Fiat Panda 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.