{"product_id":"engine-coolant-reservoir-cap","title":"ACDelco Coolant Reservoir Cap – RC77 \/ 15530112","description":"\u003cp data-end=\"529\" data-start=\"198\"\u003eGenuine \u003cstrong data-end=\"217\" data-start=\"206\"\u003eACDelco\u003c\/strong\u003e coolant overflow reservoir cap, part number \u003cstrong data-end=\"281\" data-start=\"262\"\u003eRC77 \/ 15530112\u003c\/strong\u003e, designed for factory coolant overflow tanks. Ensures proper cooling system pressure control and prevents coolant loss under temperature expansion. Perfect fit for 1986–1987 Turbo Buick 3.8L platforms and many GM vehicles using the same style cap.\u003c\/p\u003e\n\u003cp data-end=\"570\" data-start=\"531\"\u003e🔵 \u003cstrong data-end=\"570\" data-start=\"534\"\u003eBlue Dot – New \/ Never Installed\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"910\" data-start=\"572\"\u003e\u003cstrong data-end=\"591\" data-start=\"572\"\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003e• Brand: \u003cstrong data-end=\"612\" data-start=\"601\"\u003eACDelco\u003c\/strong\u003e (OEM quality)\u003cbr data-end=\"629\" data-start=\"626\"\u003e• Part Numbers: \u003cstrong data-end=\"685\" data-start=\"645\"\u003eRC77 \/ 15530112 \/ EDEL119A \/ 7506055\u003c\/strong\u003e\u003cbr data-end=\"688\" data-start=\"685\"\u003e• Type: Coolant overflow reservoir cap\u003cbr data-end=\"729\" data-start=\"726\"\u003e• Fitment: 1986–1987 Buick Grand National \/ GNX \/ Turbo T \/ T-Type\u003cbr data-end=\"798\" data-start=\"795\"\u003e• Compatible with additional GM V6 \/ V8 coolant tanks\u003cbr data-end=\"854\" data-start=\"851\"\u003e• Material: Molded composite with internal rubber seal\u003c\/p\u003e\n\u003cp data-end=\"1048\" data-start=\"912\"\u003e\u003cstrong data-end=\"932\" data-start=\"912\"\u003eCondition Notes:\u003c\/strong\u003e\u003cbr\u003e• New — never installed\u003cbr data-end=\"959\" data-start=\"956\"\u003e• Stored in box, clean and ready to install\u003cbr data-end=\"1005\" data-start=\"1002\"\u003e• No cracks, wear, or sealing ring damage\u003c\/p\u003e\n\u003cp data-end=\"1362\" data-start=\"1050\"\u003e\u003cstrong data-end=\"1070\" data-start=\"1050\"\u003eWhy You Want It:\u003c\/strong\u003e\u003cbr\u003eProper coolant pressure management is critical for preventing boil-over, leaks, and overheating — especially on boosted Turbo Buicks. A fresh OEM-spec cap helps maintain cooling efficiency, protects the head gaskets, and supports consistent performance under load and higher boost pressures.\u003c\/p\u003e\n\u003cp data-end=\"1517\" data-start=\"1364\"\u003e⚠️ All Turbo 6 Parts are sold as-is with no returns, refunds, or exchanges. Buyer is responsible for verifying fitment and compatibility before purchase.\u003c\/p\u003e\n\u003cp data-end=\"1590\" data-start=\"1519\"\u003e \u003c\/p\u003e","brand":"Watts Performance Solutions","offers":[{"title":"Default Title","offer_id":42555903279167,"sku":"pauls","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0570\/2310\/3039\/files\/ScreenShot2025-11-14at1.51.56PM.png?v=1763146437","url":"https:\/\/wattsperformance.com\/products\/engine-coolant-reservoir-cap","provider":"Watts Performance Solutions","version":"1.0","type":"link"}