{"product_id":"radiator-expansion-tank-cap-bmw-1-2-3-4-5-series-x3-x4-x5-x6-x7-17-25","title":"Radiator Bottle Cap B38 B48 B58 – BMW G Series","description":"\u003cp data-path-to-node=\"1\"\u003eThe \u003cb data-path-to-node=\"1\" data-index-in-node=\"44\"\u003eRadiator Expansion Tank Cap\u003c\/b\u003e for the modern generation of BMW G-chassis vehicles equipped with B-series modular engines. This cap is a precision-engineered pressure relief valve designed to maintain the cooling system at a constant, predetermined pressure.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eThe cooling system in modern BMWs operates under high pressure to raise the boiling point of the coolant, ensuring efficient heat transfer from the engine. This cap is designed to vent excess pressure (typically rated at 140 kPa or 2.0 bar) into the overflow system if the engine overheats, preventing hoses or the radiator from bursting. Over time, the internal rubber seals can perish, or the spring mechanism can fail, leading to coolant loss, \"low coolant\" warnings, or engine overheating. Replacing a worn cap is a simple yet vital piece of preventative maintenance to ensure the integrity of the sealed cooling system.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003eVehicle Compatibility:\u003c\/b\u003e This cap is designed for the \u003cb data-path-to-node=\"3\" data-index-in-node=\"52\"\u003eG-platform\u003c\/b\u003e vehicles using \u003cb data-path-to-node=\"3\" data-index-in-node=\"78\"\u003eB38, B46, B48,\u003c\/b\u003e and \u003cb data-path-to-node=\"3\" data-index-in-node=\"97\"\u003eB58\u003c\/b\u003e engines:\u003c\/p\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003e3 Series (G20 \/ G21):\u003c\/b\u003e 2019–Present (318i, 320i, 330i, M340i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003e5 Series (G30 \/ G31):\u003c\/b\u003e 2017–2023 (520i, 530i, 540i, M550i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003e1 \u0026amp; 2 Series (F40 \/ G42):\u003c\/b\u003e 2019–Present (118i, M135i, 220i, M240i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003e4 Series (G22 \/ G23 \/ G26):\u003c\/b\u003e 2020–Present (420i, 430i, M440i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,4,0\"\u003e\u003cb data-path-to-node=\"4,4,0\" data-index-in-node=\"0\"\u003eX3 \u0026amp; X4 (G01 \/ G02):\u003c\/b\u003e 2017–Present (20i, 30i, M40i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,5,0\"\u003e\u003cb data-path-to-node=\"4,5,0\" data-index-in-node=\"0\"\u003eX5, X6 \u0026amp; X7 (G05 \/ G06 \/ G07):\u003c\/b\u003e 2018–Present (40i, M50i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,6,0\"\u003e\u003cb data-path-to-node=\"4,6,0\" data-index-in-node=\"0\"\u003eZ4 (G29):\u003c\/b\u003e 2018–Present (sDrive20i, M40i)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"0\"\u003eSpecifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"6\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,1,0\"\u003e\u003cb data-path-to-node=\"6,1,0\" data-index-in-node=\"0\"\u003ePressure Rating:\u003c\/b\u003e 140 kPa \/ 2.0 Bar (approx. 29 PSI)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,2,0\"\u003e\u003cb data-path-to-node=\"6,2,0\" data-index-in-node=\"0\"\u003eMaterial:\u003c\/b\u003e Heat-Stabilised Composite with Ethylene Propylene Rubber (EPDM) Seals\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BMW","offers":[{"title":"Default Title","offer_id":48022493528303,"sku":"17138665638","price":395.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/7183\/5631\/files\/2020-G20-3Series-Expansion-Tank-Cap.png?v=1773831000","url":"https:\/\/myty.co.za\/products\/radiator-expansion-tank-cap-bmw-1-2-3-4-5-series-x3-x4-x5-x6-x7-17-25","provider":"MYTY Auto Parts","version":"1.0","type":"link"}