{"product_id":"thermostat-housing-hose-fits-volvo-penta-mercruiser-2-5l-3-0l-4-cylinder-replaces-3857391-32-96879","title":"Thermostat Housing Hose – Fits Volvo Penta \u0026 MerCruiser 2.5L 3.0L 4-Cylinder (Replaces 3857391, 32-96879)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eThermostat Housing Hose\u003c\/strong\u003e is designed for Volvo Penta and MerCruiser 2.5L and 3.0L 4-cylinder engines, providing a reliable connection between the thermostat housing and the circulating water pump. Built for models manufactured from 1982 through 2003, it ensures proper coolant flow and temperature regulation across compatible marine engines.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket hose directly replaces OEM part numbers 3857391, 509282, 8M0071007, 9-44050, 96879, and manufacturer PN 32-96879, offering broad cross-compatibility with factory components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision-molded to match OEM fitment on MerCruiser 4-cylinder 2.5L and 3.0L engines\u003c\/li\u003e\n  \u003cli\u003eFits model years 1982–2003 for consistent compatibility across multiple engine generations\u003c\/li\u003e\n  \u003cli\u003eConstructed to handle marine cooling system pressures and temperatures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e3857391\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e32-96879\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003ctd\u003e509282\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e8M0071007\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eAftermarket\u003c\/td\u003e\n        \u003ctd\u003e9-44050\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e96879\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e4 Cyl 2.5L\u003c\/td\u003e\n        \u003ctd\u003e1982–2003\u003c\/td\u003e\n        \u003ctd\u003e32-96879\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMerCruiser\u003c\/td\u003e\n        \u003ctd\u003e4 Cyl 3.0L\u003c\/td\u003e\n        \u003ctd\u003e1982–2003\u003c\/td\u003e\n        \u003ctd\u003e32-96879\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e4 Cyl 2.5L \/ 3.0L\u003c\/td\u003e\n        \u003ctd\u003e1982–2003\u003c\/td\u003e\n        \u003ctd\u003e3857391\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003ePart Type\u003c\/dt\u003e\n  \u003cdd\u003eHose\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eThermostat Housing to Circulating Water Pump\u003c\/dd\u003e\n  \u003cdt\u003eCompatible Engine Types\u003c\/dt\u003e\n  \u003cdd\u003eMerCruiser 4-Cylinder 2.5L, 3.0L; Volvo Penta 4-Cylinder 2.5L, 3.0L\u003c\/dd\u003e\n  \u003cdt\u003eModel Year Range\u003c\/dt\u003e\n  \u003cdd\u003e1982–2003\u003c\/dd\u003e\n  \u003cdt\u003ePrimary OEM Numbers\u003c\/dt\u003e\n  \u003cdd\u003e3857391, 32-96879\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eThermostat Housing Hose (1 piece)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDrain the cooling system and relieve any residual pressure before removing the old hose.\u003c\/li\u003e\n  \u003cli\u003eDisconnect clamps at both the thermostat housing and circulating water pump ends.\u003c\/li\u003e\n  \u003cli\u003eRemove the old hose and inspect mating surfaces for corrosion or damage.\u003c\/li\u003e\n  \u003cli\u003eClean both connection points to ensure a secure seal.\u003c\/li\u003e\n  \u003cli\u003eSlide new hose onto fittings, ensuring full seating on both ends.\u003c\/li\u003e\n  \u003cli\u003eInstall clamps and tighten to manufacturer-specified torque, avoiding over-compression.\u003c\/li\u003e\n  \u003cli\u003eRefill cooling system with appropriate marine-grade coolant mixture.\u003c\/li\u003e\n  \u003cli\u003eStart engine and check for leaks at both hose connections while monitoring temperature gauge.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm this hose fits my engine?\u003c\/summary\u003e\n  \u003cp\u003eCross-reference your engine's serial plate or existing hose part number with the compatibility table above. If your MerCruiser or Volvo Penta 2.5L or 3.0L 4-cylinder engine was built between 1982 and 2003, this hose is designed to fit.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are signs this hose needs replacement?\u003c\/summary\u003e\n  \u003cp\u003eLook for cracks, soft spots, bulging, or visible leaks at the connection points. Overheating or coolant loss without obvious leaks elsewhere may also indicate hose failure.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I reuse the old clamps?\u003c\/summary\u003e\n  \u003cp\u003eInspect clamps for corrosion, thread damage, or deformation. Replace if any wear is visible to ensure a proper seal and prevent future leaks.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eDoes this hose come pre-shaped for the engine?\u003c\/summary\u003e\n  \u003cp\u003eYes, this hose is molded to the correct angle and length for MerCruiser and Volvo Penta 4-cylinder thermostat housing installations, matching OEM routing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat coolant should I use after installation?\u003c\/summary\u003e\n  \u003cp\u003eUse marine-grade ethylene glycol coolant mixed per your engine manufacturer's recommendations, typically a 50\/50 ratio with distilled water.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow tight should I clamp the hose?\u003c\/summary\u003e\n  \u003cp\u003eTighten clamps until snug but avoid excessive force that could cut into the hose material or distort the fitting. Follow torque specs if provided in your service manual.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n  \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025601954107,"sku":"18H1004","price":37.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/ULB8c8G3qgnJXKJkSaelq6xUzXXam.webp?v=1772927899","url":"https:\/\/seasierra.com\/products\/thermostat-housing-hose-fits-volvo-penta-mercruiser-2-5l-3-0l-4-cylinder-replaces-3857391-32-96879","provider":"SeaSierra","version":"1.0","type":"link"}