{"id":462080,"date":"2026-10-07T15:02:48","date_gmt":"2026-10-07T13:02:48","guid":{"rendered":"https:\/\/ab-marineservice.com\/?post_type=product&#038;p=462080"},"modified":"2026-10-07T15:18:37","modified_gmt":"2026-10-07T13:18:37","slug":"vetus-thermostaat-71c-m2-m3-stm3521","status":"publish","type":"product","link":"https:\/\/ab-marineservice.com\/en\/product\/vetus-thermostaat-71c-m2-m3-stm3521\/","title":{"rendered":"VETUS thermostaat 71\u00b0C M2\/M3 &#8211; STM3521"},"content":{"rendered":"<h3>VETUS thermostat 71\u00b0C M2\/M3 &#8211; STM3521<\/h3>\n<p>The VETUS STM3521 is a thermostat for the internal cooling system of various VETUS M2 and M3 marine diesel engines. The thermostat regulates coolant circulation depending on the engine temperature and begins to open at approximately 71\u00b0C.<\/p>\n<p>When the engine is cold, the coolant flow remains restricted so that the engine reaches the correct operating temperature more quickly. As the temperature rises, the thermostat opens further and allows more coolant to flow through the cooling system.<\/p>\n<h4>Suitable for<\/h4>\n<p>VETUS M2.02<br \/>\nVETUS M2.04<br \/>\nVETUS M2.05<br \/>\nVETUS M2.06<br \/>\nVETUS M2.13<br \/>\nVETUS M2.18<br \/>\nVETUS M2.C5<br \/>\nVETUS M2.D5<br \/>\nVETUS M3.09<br \/>\nVETUS M3.28<br \/>\nVETUS M3.29<\/p>\n<h4>Technical specifications<\/h4>\n<p><strong>Product type:<\/strong> Thermostat<br \/>\n<strong>Opening temperature:<\/strong> 71\u00b0C<br \/>\n<strong>System:<\/strong> Internal engine cooling system<br \/>\n<strong>Function:<\/strong> Temperature-dependent regulation of coolant flow<br \/>\n<strong>Associated gasket:<\/strong> STM6251<br \/>\n<strong>Replaces part number:<\/strong> STM6250<\/p>\n<h4>Importance of a properly functioning thermostat<\/h4>\n<p>A defective thermostat can cause the engine to warm up too slowly, run too cold or receive insufficient cooling. A properly functioning thermostat helps keep the engine within the correct temperature range and supports reliable operation of the cooling system.<\/p>\n<h4>Installation and maintenance<\/h4>\n<p>When replacing the thermostat, also check the thermostat housing and associated gasket. It is recommended to replace the gasket when the thermostat housing is opened, so that a reliable seal of the cooling system is maintained.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The VETUS STM3521 is a thermostat for various VETUS M2 and M3 marine diesel engines. The thermostat begins to open at approximately 71\u00b0C and regulates the coolant flow so that the engine quickly reaches operating temperature and is cooled correctly during use.<\/p>\n<h4>Key features and benefits<\/h4>\n<p><strong>Product type:<\/strong> Thermostat<br \/>\n<strong>Opening temperature:<\/strong> 71\u00b0C<br \/>\n<strong>Application:<\/strong> Engine cooling system<br \/>\n<strong>Suitable engines:<\/strong> VETUS M2 and M3 series<br \/>\n<strong>Function:<\/strong> Regulates coolant flow based on engine temperature<br \/>\n<strong>Associated gasket:<\/strong> STM6251<br \/>\n<strong>Replaces:<\/strong> STM6250<br \/>\n<strong>Design:<\/strong> Original VETUS replacement part<\/p>\n","protected":false},"featured_media":462083,"comment_status":"open","ping_status":"closed","template":"","meta":[],"location":[],"product_brand":[31963],"product_cat":[2585,22115,31717],"product_tag":[],"class_list":["post-462080","product","type-product","status-publish","has-post-thumbnail","product_brand-vetus","product_cat-engine-parts","product_cat-parts-by-brand","product_cat-vetus-engine-parts","first","instock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"group_of_quantity":0,"min_quantity":0,"max_quantity":"","exclude_order_quantity_value_rules":"no","exclude_category_quantity_rules":"no","combine_variations":"no","locations":[{"id":32184,"name":"Vetus","slug":"vetus","quantity":""}],"_links":{"self":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product\/462080","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/comments?post=462080"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/media\/462083"}],"wp:attachment":[{"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/media?parent=462080"}],"wp:term":[{"taxonomy":"location","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/location?post=462080"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product_brand?post=462080"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product_cat?post=462080"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/ab-marineservice.com\/en\/wp-json\/wp\/v2\/product_tag?post=462080"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}