{"product_id":"toyota-radiator-cap-sub-assembly-16401-31650-direct-fit-factory-pressure-rating","title":"Toyota Radiator Cap Sub-Assembly 16401-31650 – Direct-Fit, Factory Pressure Rating","description":"\u003cp\u003e\u003cstrong\u003eToyota 16401-31650 Radiator Cap Sub-Assembly is the factory-style pressure cap that seals the cooling system and helps maintain proper coolant pressure.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis genuine-style radiator cap replaces the original and is built to match Toyota's specifications for fit and function. Designed for direct fitment, the sub-assembly provides a secure seal for the expansion tank or radiator neck, helping the cooling system operate as intended under normal driving conditions. It’s a compact replacement part that’s simple to install yet critical to overall cooling performance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this radiator cap affect cooling system performance?\u003c\/h3\u003e\n\u003cp\u003eThe cap controls the pressure threshold in the cooling circuit, which influences boiling point and coolant flow. A correct-pressure cap helps prevent premature boiling and minimizes the risk of coolant loss through overflow. Using the right cap keeps the system balanced and supports consistent engine temperatures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFactory-spec pressure rating matched to Toyota requirements\u003c\/li\u003e\n  \u003cli\u003eSecure sealing gasket reduces coolant evaporation and leaks\u003c\/li\u003e\n  \u003cli\u003eRobust spring mechanism maintains pressure under heat cycles\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this part an exact replacement for the original Toyota component?\u003c\/h3\u003e\n\u003cp\u003eYes — the sub-assembly is manufactured to align with the original part’s dimensions and performance characteristics. That means it installs without modification and works with the existing neck and overflow plumbing. Choosing a matching part number reduces fitment issues and simplifies service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect-fit design for straightforward, no-modification installation\u003c\/li\u003e\n  \u003cli\u003eCompatibility with vehicles specified by Toyota for 16401-31650\u003c\/li\u003e\n  \u003cli\u003eOEM-style materials for long-term durability\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install the radiator cap and what maintenance is needed?\u003c\/h3\u003e\n\u003cp\u003eInstallation is quick: remove the old cap when the engine is cool, inspect the filler neck, then press and twist the new cap into place until it seats. Periodically check the cap and neck for corrosion, cracks, or degraded seals and replace if any damage appears. Always follow safety precautions and only open the system when the engine has cooled.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstall only on a cold engine to avoid scalding from hot coolant\u003c\/li\u003e\n  \u003cli\u003eInspect gasket and spring for wear during routine coolant checks\u003c\/li\u003e\n  \u003cli\u003eReplace if cap fails to hold pressure or shows visible damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and construction ensure this cap lasts?\u003c\/h3\u003e\n\u003cp\u003eThe assembly combines corrosion-resistant metals and heat-tolerant elastomers engineered to withstand repeated thermal cycling. The spring and sealing surfaces are designed to retain their properties over many heat-and-cool cycles, helping the cap maintain consistent pressure control. Durable construction reduces the frequency of replacements compared with lower-grade aftermarket options.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMetal body components resist rust and deformation\u003c\/li\u003e\n  \u003cli\u003eHigh-temperature gasket materials maintain a reliable seal\u003c\/li\u003e\n  \u003cli\u003eQuality spring hardware preserves set pressure over time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Ideal for Toyota owners, independent mechanics, and fleet maintenance teams that need a dependable, OEM-compatible radiator cap. If you require a direct-replacement component that fits precisely and restores the intended pressure control of the cooling system, this sub-assembly delivers a straightforward, durable solution.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the 16401-31650 cap an exact Toyota OEM part?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. This sub-assembly is manufactured to match Toyota's original specifications for direct fit and function.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I replace the cap myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Replace only when the engine is cool; press-and-twist installation is straightforward for most DIYers.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Toyota","offers":[{"title":"Default Title","offer_id":48084766982302,"sku":"B00GD3171E","price":37.04,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/toyota-radiator-cap-front-view.jpg?v=1785862395","url":"https:\/\/northtrailauto.ca\/products\/toyota-radiator-cap-sub-assembly-16401-31650-direct-fit-factory-pressure-rating","provider":"North Trail Auto","version":"1.0","type":"link"}