{"product_id":"gxywady-coolant-overflow-tank-hd81-87-for-1981-1991-gm-trucks-with-cap-heat-resistant-direct-fit","title":"GXYWADY Coolant Overflow Tank HD81-87 for 1981–1991 GM Trucks with Cap — Heat‑Resistant, Direct-Fit","description":"\u003cp\u003e\u003cstrong\u003eGXYWADY Coolant Overflow Tank with Cap (HD81-87) is a direct-fit replacement reservoir designed for 1981–1991 GM full-size trucks and SUVs to restore coolant containment and pressure control.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your original coolant overflow tank has cracked, warped, or the cap no longer seals, this GXYWADY HD81-87 unit provides an OEM-style replacement made from heat- and vibration-resistant plastic. It fits classic CK-series trucks and related Blazer, Suburban, and RV pickup models covered by the original part numbers, and includes a matching cap to help re-establish correct coolant overflow and return behavior.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles does this replacement tank fit?\u003c\/h3\u003e\n\u003cp\u003eThis overflow tank is manufactured to replace the original reservoirs used on GM full-size vehicles from the early 1980s to early 1990s. Confirm fitment against your vehicle model year and CK-series or RV pickup application before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for GM 1981–1987 CK series trucks.\u003c\/li\u003e\n  \u003cli\u003eCompatible with 1988–1991 RV-style pickups, Blazer, and Suburban models.\u003c\/li\u003e\n  \u003cli\u003eListed under part number HD81-87 for cross-reference.\u003c\/li\u003e\n  \u003cli\u003eCheck your factory diagram to verify mounting points and hose connections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the GXYWADY tank improve cooling system performance?\u003c\/h3\u003e\n\u003cp\u003eBy restoring a properly sealed overflow reservoir, the tank helps the cooling system maintain correct fluid levels and pressure cycles during engine warm-up and cooldown. A functional tank reduces coolant loss and helps the system reintroduce returned fluid to the radiator instead of wasting it.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSealed cap reduces vapor loss and helps maintain system pressure.\u003c\/li\u003e\n  \u003cli\u003eProper overflow\/return action minimizes air entry into coolant lines.\u003c\/li\u003e\n  \u003cli\u003eDurable plastic resists heat and vibration for longer service life.\u003c\/li\u003e\n  \u003cli\u003eHelps support consistent engine operating temperature management.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the build quality and material features?\u003c\/h3\u003e\n\u003cp\u003eThe reservoir is molded from stabilized plastics chosen to withstand under-hood temperatures and engine vibration typical of older full-size trucks. The included cap is designed to mate securely and restore the original fit and sealing properties.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeat-resistant plastic construction for thermal durability.\u003c\/li\u003e\n  \u003cli\u003eVibration-tolerant design to resist cracks and leaks.\u003c\/li\u003e\n  \u003cli\u003eFactory-style hose ports and mounting bosses for straightforward installation.\u003c\/li\u003e\n  \u003cli\u003eSold as a replacement assembly with matching cap included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow easy is installation and what should I check before buying?\u003c\/h3\u003e\n\u003cp\u003eInstallation is generally straightforward for someone with basic mechanical skills and standard hand tools: drain excess coolant as needed, remove the old tank, transfer any reusable fittings, and fasten the new tank in place. Always compare mounting points, hose diameters, and part number HD81-87 against your vehicle to ensure compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBasic hand tools required; no major modifications expected.\u003c\/li\u003e\n  \u003cli\u003eVerify hose sizes and mounting boss locations before purchase.\u003c\/li\u003e\n  \u003cli\u003eDrain minimal coolant to prevent spills when swapping tanks.\u003c\/li\u003e\n  \u003cli\u003eRe-use undamaged brackets or replace if corroded for secure fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: GXYWADY’s HD81-87 coolant overflow tank is intended for owners, restorers, and mechanics working on 1981–1987 CK-series GM trucks or 1988–1991 RV trucks, Blazers, and Suburbans who need a reliable, OEM-style replacement reservoir. It’s well suited for anyone restoring an older vehicle to safe operating condition or replacing a leaking or brittle factory tank without modifying the cooling system.\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: Does this tank include the cap?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The GXYWADY HD81-87 replacement is supplied with the matching cap to restore sealing and overflow function.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fit my 1985 CK-series truck?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Likely yes for 1981–1987 CK-series models, but verify part number HD81-87 and mount\/hose alignment before buying.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GXYWADY","offers":[{"title":"Default Title","offer_id":67587503915193,"sku":"B0CHDQW9MR","price":114.28,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/gxywady-overflow-tank-front-view.jpg?v=1790510756","url":"https:\/\/redleafauto.ca\/products\/gxywady-coolant-overflow-tank-hd81-87-for-1981-1991-gm-trucks-with-cap-heat-resistant-direct-fit","provider":"Redleaf Auto","version":"1.0","type":"link"}