{"product_id":"gates-engine-coolant-thermostat-oe-type-187-f-opening-direct-fit-with-bottom-by-pass-integrated-o-ring","title":"Gates Engine Coolant Thermostat OE Type — 187°F Opening, Direct-Fit with Bottom By-pass \u0026 Integrated O-ring","description":"\u003cp\u003e\u003cstrong\u003eThe Gates 34198 OE Type Engine Coolant Thermostat is a direct-fit replacement thermostat calibrated to open at 187º with a bottom by-pass and integrated O-ring for leak-free operation.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis thermostat restores correct engine temperature management by matching original equipment fit and function. Manufactured to Gates' factory-controlled tolerances, the 34198 ensures consistent opening and closing behavior across pressure and temperature variations. It includes jiggle pins for reliable air venting and the seals and gaskets needed to replicate the original part’s performance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this thermostat maintain accurate engine temperature?\u003c\/h3\u003e\n\n\u003cp\u003eThe Gates 34198 uses a factory-calibrated wax element and precision valve assembly to open at the specified temperature and close securely as the engine cools. That controlled action helps the cooling system operate within its designed temperature window without premature or delayed opening.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCalibrated to open at 187º for stable temperature control\u003c\/li\u003e\n  \u003cli\u003eQuality-controlled manufacturing for repeatable opening\/closing\u003c\/li\u003e\n  \u003cli\u003eValve design resists sticking under pressure changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my vehicle and replace the original part?\u003c\/h3\u003e\n\n\u003cp\u003eGates engineers the 34198 to meet OE form, fit and function so it installs like the original thermostat. It includes equivalent seals, gaskets and an O-ring where applicable to ensure the same mounting and sealing characteristics as the factory unit.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOEM-equivalent dimensions for direct replacement\u003c\/li\u003e\n  \u003cli\u003eIncludes necessary seals and O-ring for leak-free installation\u003c\/li\u003e\n  \u003cli\u003eDesigned to match original venting and by-pass pathways\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat features help with installation and long-term reliability?\u003c\/h3\u003e\n\n\u003cp\u003eThe thermostat is supplied ready to install with jiggle pins to purge trapped air during system fill, reducing the risk of airlocks and overheating symptoms. Durable materials and precision assembly lower the chance of premature failure compared with generic aftermarket parts.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eJiggle pins simplify air venting during coolant replacement\u003c\/li\u003e\n  \u003cli\u003eSeals and gaskets included for a secure, leak-free fit\u003c\/li\u003e\n  \u003cli\u003eRobust construction for consistent performance over time\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the 187º bottom by-pass design affect cooling system behavior?\u003c\/h3\u003e\n\n\u003cp\u003eThe 187º rating indicates the temperature at which the thermostat begins to open and allow coolant flow; the bottom by-pass design provides a controlled amount of coolant circulation before full opening. This helps the engine reach and maintain optimal running temperature more quickly while still allowing limited circulation for components that need minimal flow at idle.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e187º opening point tuned to specific engine requirements\u003c\/li\u003e\n  \u003cli\u003eBottom by-pass provides measured circulation before full opening\u003c\/li\u003e\n  \u003cli\u003eHelps balance warm-up speed with component cooling needs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Gates 34198 OE Type Thermostat is aimed at vehicle owners, professional mechanics and DIY enthusiasts seeking an exact-fit replacement that mirrors factory performance. If you need a thermostat with a specific 187º opening, original-equipment sealing, and features that simplify bleeding and installation, this part delivers a direct swap for compatible engines without aftermarket guesswork.\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 temperature does the Gates 34198 thermostat open at?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is calibrated to begin opening at 187º to match the specified engine operating range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the thermostat include seals and an O-ring?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the Gates 34198 includes the appropriate seals and an O-ring for a leak-free, OEM-equivalent fit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Gates","offers":[{"title":"Default Title","offer_id":55164757541207,"sku":"B009CLBGZ6","price":32.77,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/gates-34198-front-view-packaging.jpg?v=1790354085","url":"https:\/\/britishgarage.co.uk\/products\/gates-engine-coolant-thermostat-oe-type-187-f-opening-direct-fit-with-bottom-by-pass-integrated-o-ring","provider":"British Garage","version":"1.0","type":"link"}