{"product_id":"thermostat-fits-johnson-evinrude-185-225hp-replaces-0437090-437090-0436174","title":"Thermostat – Fits Johnson\/Evinrude 185-225HP (Replaces 0437090, 437090, 0436174)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\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\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\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 aftermarket \u003cstrong\u003eThermostat – Fits Johnson\/Evinrude 185HP, 200HP, 225HP\u003c\/strong\u003e is a high-quality replacement designed for Johnson\/Evinrude 185–225 HP V6 outboard engines from 1993–1994. It ensures your engine maintains the correct operating temperature for optimal performance and fuel efficiency.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct interchange for Johnson\/Evinrude part numbers 0437090, 437090, 0765585, 0436174, and 0435100, and also cross-references with Sierra 18-3545 and Mallory 9-43031.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls as a direct OEM-equivalent replacement.\u003c\/li\u003e\n  \u003cli\u003eCompatible with all standard marine fuel types.\u003c\/li\u003e\n  \u003cli\u003eManufactured in an ISO9002 certified factory to meet or exceed OEM specifications.\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\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e0437090 \/ 437090\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e0765585\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e0436174\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eJohnson\/Evinrude\u003c\/td\u003e\n\u003ctd\u003e0435100\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3545\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-43031\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\u003cp\u003eThis part fits specific Johnson models starting with J185, J200, J225, and VJ225 from 1993–1994.\u003c\/p\u003e\n\u003cp\u003eThis part fits specific Evinrude models starting with E185, E200, E225, and VE225 from 1993–1994.\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\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\u003c\/td\u003e\n        \u003ctd\u003eJ185 series\u003c\/td\u003e\n        \u003ctd\u003e185\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with J185\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\u003c\/td\u003e\n        \u003ctd\u003eJ200 series\u003c\/td\u003e\n        \u003ctd\u003e200\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with J200\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\u003c\/td\u003e\n        \u003ctd\u003eJ225 series\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with J225\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eJohnson\u003c\/td\u003e\n        \u003ctd\u003eVJ225 series\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with VJ225\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEvinrude\u003c\/td\u003e\n        \u003ctd\u003eE185 series\u003c\/td\u003e\n        \u003ctd\u003e185\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with E185\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEvinrude\u003c\/td\u003e\n        \u003ctd\u003eE200 series\u003c\/td\u003e\n        \u003ctd\u003e200\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with E200\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEvinrude\u003c\/td\u003e\n        \u003ctd\u003eE225 series\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with E225\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eEvinrude\u003c\/td\u003e\n        \u003ctd\u003eVE225 series\u003c\/td\u003e\n        \u003ctd\u003e225\u003c\/td\u003e\n        \u003ctd\u003e2-Stroke\u003c\/td\u003e\n        \u003ctd\u003e1993–1994\u003c\/td\u003e\n        \u003ctd\u003e0437090, 437090\u003c\/td\u003e\n        \u003ctd\u003eAll models starting with VE225\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\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eThermostat\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect OEM replacement\u003c\/dd\u003e\n  \u003cdt\u003eFuel Type\u003c\/dt\u003e\n\u003cdd\u003eCompatible with all marine fuels\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eDirect mounting in thermostat housing\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eSilver\/metallic\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eManufactured to OEM specifications in ISO9002 certified factory\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1 x\u003c\/span\u003e Thermostat (0437090\/437090)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the negative battery cable before beginning work.\u003c\/li\u003e\n  \u003cli\u003eAllow the engine to cool completely and drain the cooling system.\u003c\/li\u003e\n  \u003cli\u003eLocate the thermostat housing on the engine block.\u003c\/li\u003e\n  \u003cli\u003eCarefully remove the bolts securing the housing cover.\u003c\/li\u003e\n  \u003cli\u003eRemove the old thermostat and gasket. Note the orientation of the thermostat.\u003c\/li\u003e\n  \u003cli\u003eThoroughly clean the mating surfaces of the housing and cover, removing all old gasket material.\u003c\/li\u003e\n  \u003cli\u003eInstall the new thermostat in the correct orientation (typically spring-side towards the engine).\u003c\/li\u003e\n  \u003cli\u003ePosition a new gasket and reinstall the housing cover, tightening bolts to the manufacturer's specified torque.\u003c\/li\u003e\n  \u003cli\u003eRefill the cooling system with the appropriate coolant.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery, start the engine, and carefully check for leaks as it warms up.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I know if my thermostat has failed?\u003c\/summary\u003e\n  \u003cp\u003eCommon signs of a faulty thermostat include the engine overheating at low speeds or running too cool and failing to reach its normal operating temperature. An inconsistent temperature gauge reading can also indicate a problem.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs a new gasket required for installation?\u003c\/summary\u003e\n  \u003cp\u003eYes, it is strongly recommended to replace the thermostat housing gasket whenever you replace the thermostat. This helps ensure a proper seal and prevent coolant leaks. This package contains the thermostat only.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat are the signs of a failing thermostat?\u003c\/summary\u003e\n  \u003cp\u003eSymptoms include engine overheating (especially at idle or low speeds), the engine taking an unusually long time to warm up, or erratic temperature gauge readings. An engine that runs too cool can suffer from poor performance and efficiency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow often should a marine thermostat be replaced?\u003c\/summary\u003e\n  \u003cp\u003eThere is no fixed interval, but thermostats are a common wear item. It's good practice to inspect it during regular cooling system service or replace it every few hundred hours or every few years, especially if operating in saltwater.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eMy engine model is listed, but my year is 1995. Will this fit?\u003c\/summary\u003e\n  \u003cp\u003eNo. This thermostat is specifically for models from 1993–1994. Engine parts can be highly year-specific. Do not purchase if your model year falls outside the specified range.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the difference between OEM and this aftermarket part?\u003c\/summary\u003e\n  \u003cp\u003eThis listing is an aftermarket replacement, not an OEM component. It has been engineered and manufactured to meet or exceed OEM-level specifications using comparable materials in an ISO 9002 certified facility and is batch-inspected for quality and consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow fast is shipping?\u003c\/summary\u003e\n  \u003cp\u003eWe ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions, with expedited options available at checkout where applicable.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is the warranty and return policy?\u003c\/summary\u003e\n  \u003cp\u003eThis product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should an issue arise, contact our support team with your order details. Returns are accepted within our standard window if the item is unused and in its original packaging. Please see our full policy page or contact us 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 and specifications against your original part before ordering. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement component, not an original equipment manufacturer (OEM) part.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is highly recommended for safety, proper function, and to avoid engine damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions, typically arriving in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — We offer fair pricing without compromising on materials or quality control by working directly with our manufacturing partners.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723789668667,"sku":"21TH017","price":18.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Thermostat_for_Johnson_Evinrude_185HP_200HP_225HP_0437090_437090_0436174_437090_-_JLM_MARINE-8290954.jpg?v=1763031825","url":"https:\/\/seasierra.com\/products\/thermostat-fits-johnson-evinrude-185-225hp-replaces-0437090-437090-0436174","provider":"SeaSierra","version":"1.0","type":"link"}