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Jaguar S-Type 2004 V8 4.2 Water coolant expansion tank reservoir 4R838B099AA

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£40.00
£40.00
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This is a genuine OEM water coolant expansion tank / reservoir bottle for the Jaguar S-Type fitted with the 4.2 V8 petrol engine. The expansion tank forms part of the engine cooling system, storing excess coolant and maintaining correct coolant pressure and circulation during engine operation.


Manufactured to Jaguar factory specifications, this coolant reservoir ensures proper fitment and reliable cooling system performance—ideal for replacing cracked, leaking, or discoloured expansion tanks.


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Part Details


* Genuine Jaguar OEM part

* Part number: 4R83-8B099-AA

* Also referenced as:

* 4R838B099AA

* Coolant expansion tank

* Header tank

* Coolant reservoir bottle

* Component: Engine coolant expansion reservoir

* Engine type: 4.2 V8 Petrol

* Material: OEM heat-resistant moulded plastic

* Position: Engine bay cooling system


Jaguar coolant reservoir listings identify this tank as compatible with S-Type, XJ, and XF cooling systems using the same reservoir design.


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Compatibility


* Jaguar S-Type (X200 / X202) – 2002 to 2008


Compatible with:


* 4.2 V8 Petrol

* 2.5 V6

* 3.0 V6

* S-Type R


May also fit selected:


* Jaguar XJ X350

* Jaguar XF


where the same coolant reservoir configuration is used.


⚠️ Always compare:


* Part number

* Hose outlet positions

* Sensor type

* Cap style


before purchase.


⸻


Function & Benefits


* Stores and regulates engine coolant expansion

* Maintains cooling system pressure

* Helps prevent coolant loss and overheating

* Supports proper coolant circulation

* Direct OEM replacement – no modification required


A faulty expansion tank can cause:


* Coolant leaks

* Low coolant warnings

* Engine overheating

* Cracks around hose connections

* Cooling system pressure loss


Jaguar S-Type expansion tanks are known to become brittle with age and heat cycling.

Type: Coolant Expansion Tank

Brand: Jaguar

Manufacturer Part Number: 4R838B099AA

MPN: 4R838B099AA

Reference OE/OEM Number: 4R838A080AD

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Jaguar S-Type 2004 V8 4.2 Water coolant expansion tank reservoir 4R838B099AA

£40.00

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