{"product_id":"acdelco-radiator-cap-rc85-15-psi-gm-original-equipment-direct-fit-replacement-spring-loaded-seal","title":"ACDelco radiator cap RC85 15 PSI GM Original Equipment direct-fit replacement — spring-loaded seal","description":"\u003cp\u003e\u003cstrong\u003eACDelco RC85 (15042975) 15 P.S.I. radiator cap is a GM Original Equipment replacement that seals the cooling system and maintains the specified 15 PSI pressure for reliable engine cooling performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis ACDelco GM Original Equipment radiator cap is a direct-fit replacement engineered to the same specifications used by General Motors. It’s a spring-loaded pressure cap designed to seal the radiator filler neck or surge tank, preserve system pressure while the engine warms up, and return excess coolant from the expansion tank when the engine cools. Manufactured for durability and consistent performance, the RC85 (15042975) helps preserve the cooling system’s operating conditions and supports the long-term health of your GM vehicle’s engine cooling components.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the RC85 cap control cooling system pressure?\u003c\/h3\u003e\n\u003cp\u003eThe RC85 uses a calibrated spring and sealing assembly to hold the cooling system at 15 PSI during operation. By maintaining the designed pressure, it raises the coolant’s boiling point within safe limits and helps prevent localized boiling or vapor lock under normal engine loads.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-set 15 P.S.I. valve for consistent pressure control\u003c\/li\u003e\n  \u003cli\u003eSpring-loaded design that opens to bleed excess pressure\u003c\/li\u003e\n  \u003cli\u003eSealing gasket prevents coolant leakage at the filler neck\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this radiator cap fit my GM vehicle?\u003c\/h3\u003e\n\u003cp\u003eThe RC85 (15042975) is produced as a vehicle-specific OE replacement for many GM models. Check your vehicle’s service manual or parts lookup to confirm compatibility with your year and engine configuration.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOEM part number: 15042975 (RC85) for direct identification\u003c\/li\u003e\n  \u003cli\u003eVehicle-specific fit type—match to your GM model for correct fitment\u003c\/li\u003e\n  \u003cli\u003eDesigned to align with original filler neck dimensions and sealing surfaces\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat benefits does an OE ACDelco cap deliver compared with generic caps?\u003c\/h3\u003e\n\u003cp\u003eACDelco GM Original Equipment caps are manufactured to the same tolerances and materials specified by GM, which helps ensure consistent pressure performance, proper sealing, and longevity. Using an OE cap reduces the risk of under- or over-pressurization that can shorten cooling-system component life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBuilt to GM quality and dimensional specifications for reliable fit\u003c\/li\u003e\n  \u003cli\u003eMaterials selected for durability under engine heat cycles\u003c\/li\u003e\n  \u003cli\u003eMinimizes risk of coolant loss or pressure-related cooling issues\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I inspect and replace the radiator cap safely?\u003c\/h3\u003e\n\u003cp\u003eOnly remove the cap when the engine and cooling system are cool to avoid scalding from pressurized hot coolant. Inspect the cap for worn gaskets, weakened spring action, or visible corrosion, and replace with the RC85 if you spot any defects or if the cap fails to hold pressure.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAllow engine to cool fully before removing the cap\u003c\/li\u003e\n  \u003cli\u003eCheck gasket integrity, spring tension, and exterior corrosion\u003c\/li\u003e\n  \u003cli\u003eInstall the RC85 by seating and turning until secure—verify a snug seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The ACDelco RC85 (15042975) 15 P.S.I. radiator cap is intended for owners and technicians of GM vehicles seeking a direct OEM-style replacement. It’s appropriate for anyone who wants a factory-spec, vehicle-specific cap that preserves coolant pressure, prevents leaks at the filler neck, and supports the cooling system’s designed operating conditions. Ideal for routine maintenance, cooling-system overhauls, or whenever a damaged, leaking, or mismatched cap needs replacement to restore reliable cooling performance.\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: What pressure is the ACDelco RC85 radiator cap rated for?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The RC85 (15042975) is rated at 15 P.S.I., designed to maintain your GM cooling system at that specified pressure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this cap on non-GM vehicles?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This cap is vehicle-specific and built to GM OE dimensions; confirm filler-neck fitment before using on non-GM vehicles.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"ACDelco","offers":[{"title":"Default Title","offer_id":67592641052857,"sku":"B000C9S78G","price":58.73,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/acdelco-rc85-front-view.jpg?v=1790566628","url":"https:\/\/redleafauto.ca\/products\/acdelco-radiator-cap-rc85-15-psi-gm-original-equipment-direct-fit-replacement-spring-loaded-seal","provider":"Redleaf Auto","version":"1.0","type":"link"}