{"product_id":"jaguar-s-type-2004-v8-4-2-water-coolant-expansion-tank-reservoir-4r838b099aa","title":"Jaguar S-Type 2004 V8 4.2 Water coolant expansion tank reservoir 4R838B099AA","description":"\u003cp\u003eWill need a flush \/ clean \u003c\/p\u003e\u003cbr\u003e\u003cp\u003eLoc27\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eManufactured to Jaguar factory specifications, this coolant reservoir ensures proper fitment and reliable cooling system performance—ideal for replacing cracked, leaking, or discoloured expansion tanks.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e⸻\u003c\/p\u003e\u003cbr\u003e\u003cp\u003ePart Details\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* Genuine Jaguar OEM part\u003c\/p\u003e\u003cp\u003e* Part number: 4R83-8B099-AA\u003c\/p\u003e\u003cp\u003e* Also referenced as:\u003c\/p\u003e\u003cp\u003e * 4R838B099AA\u003c\/p\u003e\u003cp\u003e * Coolant expansion tank\u003c\/p\u003e\u003cp\u003e * Header tank\u003c\/p\u003e\u003cp\u003e * Coolant reservoir bottle\u003c\/p\u003e\u003cp\u003e* Component: Engine coolant expansion reservoir\u003c\/p\u003e\u003cp\u003e* Engine type: 4.2 V8 Petrol\u003c\/p\u003e\u003cp\u003e* Material: OEM heat-resistant moulded plastic\u003c\/p\u003e\u003cp\u003e* Position: Engine bay cooling system\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eJaguar coolant reservoir listings identify this tank as compatible with S-Type, XJ, and XF cooling systems using the same reservoir design.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e⸻\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eCompatibility\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* Jaguar S-Type (X200 \/ X202) – 2002 to 2008\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eCompatible with:\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* 4.2 V8 Petrol\u003c\/p\u003e\u003cp\u003e* 2.5 V6\u003c\/p\u003e\u003cp\u003e* 3.0 V6\u003c\/p\u003e\u003cp\u003e* S-Type R\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eMay also fit selected:\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* Jaguar XJ X350\u003c\/p\u003e\u003cp\u003e* Jaguar XF\u003c\/p\u003e\u003cbr\u003e\u003cp\u003ewhere the same coolant reservoir configuration is used.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e⚠️ Always compare:\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* Part number\u003c\/p\u003e\u003cp\u003e* Hose outlet positions\u003c\/p\u003e\u003cp\u003e* Sensor type\u003c\/p\u003e\u003cp\u003e* Cap style\u003c\/p\u003e\u003cbr\u003e\u003cp\u003ebefore purchase.\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e⸻\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eFunction \u0026amp; Benefits\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* Stores and regulates engine coolant expansion\u003c\/p\u003e\u003cp\u003e* Maintains cooling system pressure\u003c\/p\u003e\u003cp\u003e* Helps prevent coolant loss and overheating\u003c\/p\u003e\u003cp\u003e* Supports proper coolant circulation\u003c\/p\u003e\u003cp\u003e* Direct OEM replacement – no modification required\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eA faulty expansion tank can cause:\u003c\/p\u003e\u003cbr\u003e\u003cp\u003e* Coolant leaks\u003c\/p\u003e\u003cp\u003e* Low coolant warnings\u003c\/p\u003e\u003cp\u003e* Engine overheating\u003c\/p\u003e\u003cp\u003e* Cracks around hose connections\u003c\/p\u003e\u003cp\u003e* Cooling system pressure loss\u003c\/p\u003e\u003cbr\u003e\u003cp\u003eJaguar S-Type expansion tanks are known to become brittle with age and heat cycling.\u003c\/p\u003e\u003cdiv\u003e\n\u003cp\u003e\u003cstrong\u003eType:\u003c\/strong\u003e Coolant Expansion Tank\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Jaguar\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 4R838B099AA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMPN:\u003c\/strong\u003e 4R838B099AA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReference OE\/OEM Number:\u003c\/strong\u003e 4R838A080AD\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Jaguar","offers":[{"title":"Default Title","offer_id":53898785653063,"sku":"157904185562","price":40.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/1528\/3527\/files\/10_289e3cf8-e9eb-4034-b323-ad322a39c740.jpg?v=1778578017","url":"https:\/\/spares4repairs.store\/products\/jaguar-s-type-2004-v8-4-2-water-coolant-expansion-tank-reservoir-4r838b099aa","provider":"Spares 4 Repairs","version":"1.0","type":"link"}