{"product_id":"esr63a-clear-expansion-tank","title":"Clear Expansion Tank for Defender 90 – ESR63A","description":"\u003cp\u003eThe expansion tank, also known as the coolant overflow or header tank, stores excess coolant displaced as the engine reaches operating temperature and returns it to the cooling system as it cools. This clear plastic variant allows visual inspection of coolant level without removing the cap, aiding in early detection of coolant loss that can indicate head gasket failure, hose deterioration, or a cracked tank. A faulty or opaque tank makes it impossible to monitor coolant levels accurately, increasing the risk of overheating.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eManufactured from clear plastic, allowing direct visual coolant level inspection without cap removal\u003c\/li\u003e\n\u003cli\u003eDirect replacement fitment requiring no modification to existing hose connections\u003c\/li\u003e\n\u003cli\u003eSupplied as a single unit to OEM specification for the Defender cooling system\u003c\/li\u003e\n\u003cli\u003eWhen replacing, inspect the associated hoses, cap seal, and coolant condition - deteriorated coolant accelerates tank discolouration and cracking\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\n\u003cp\u003eThis expansion tank is compatible with the Land Rover Defender, including the 90 variant - confirm compatibility against your specific model year and engine configuration before ordering.\u003c\/p\u003e\n\u003cp\u003eNot sure about fitment? Feel free to get in touch at \u003ca href=\"mailto:info@thomasperformance.co.uk\"\u003einfo@thomasperformance.co.uk\u003c\/a\u003e\u003c\/p\u003e","brand":"Britpart","offers":[{"title":"Default Title","offer_id":55814731170136,"sku":"ESR63A","price":31.87,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0890\/0070\/6392\/files\/ESR63A_3-600x600.jpg?v=1758807553","url":"https:\/\/thomasperformance.co.uk\/products\/esr63a-clear-expansion-tank","provider":"Thomas Performance Ltd","version":"1.0","type":"link"}