Cooling matrix under car

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My Name: jabvfr2019

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Model: C3 2002-2005, Original shape model
Year: 2004 (04)
Engine Size: 1.4
Fuel Type: Diesel
Mileage: 100000
Trim Level: NA
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: LHD (Europe)

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I have a 2004 1.4HDi.

I have noticed a cooling matrix of some sort under the car inline with the front seats. Can anyone tell me what it is for please, and should it have a cover?

Thanks.
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My Name: Arfur Dent

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Model: C3 2002-2005, Original shape model
Year: 2002 (52)
Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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jabvfr2019 wrote: ↑Tue Aug 17, 2021 6:28 pm I have a 2004 1.4HDi.

I have noticed a cooling matrix of some sort under the car inline with the front seats. Can anyone tell me what it is for please, and should it have a cover?

Thanks.
Hello

It is the diesel fuel return cooling system. It cools the return fuel for the tank in free air. Adding a cover would reduce the cooling efficiency, I would imagine.
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