{"product_id":"fleece-performance-coolant-bypass-kit-stainless-steel-hose-5-9-6-7l-cummins","title":"Fleece Performance Coolant Bypass Kit – Stainless Steel Hose | 5.9\/6.7L Cummins","description":"\u003ch2\u003eIncreased Coolant Flow. Decreased Coolant Temperatures.\u003c\/h2\u003e\u003cp\u003eThe rear cylinders on the 5.9\/6.7L Cummins are prone to restricted coolant flow, resulting in the highest coolant temperatures in the engine. Over time, this can lead to excessive pressure buildup in the cooling system—particularly at the rear of the block—causing freeze plugs to blow out externally or smaller-diameter plugs under the valve cover to fail.\u003c\/p\u003e\u003cp\u003eThe Fleece Performance Coolant Bypass Kit solves this problem at the source. Unlike competing products that only react to excessive pressure, our kit features a secondary thermostat that operates based on \u003cstrong\u003etemperature\u003c\/strong\u003e, addressing the issue before dangerous pressure levels ever develop. The result is consistent coolant temperatures across all six cylinders.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eLowers coolant temperature at the rear cylinders\u003c\/li\u003e\n\u003cli\u003eEnsures consistent temperatures across all six cylinders\u003c\/li\u003e\n\u003cli\u003ePrevents damaging coolant pressure buildup\u003c\/li\u003e\n\u003cli\u003eComplete kit includes \u003cstrong\u003estainless steel hose\u003c\/strong\u003e and AN O-ring fittings for a leak-free installation\u003c\/li\u003e\n\u003cli\u003eKits for MY 2003+ include billet hose brackets\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy You Need a Fleece Performance Coolant Bypass\u003c\/h3\u003e\u003cp\u003eCoolant flow restriction to the rear cylinders is one of the most common and serious issues on the 5.9\/6.7L Cummins platform. Left unaddressed, it can lead to catastrophic freeze plug blowouts caused by over-temperature and over-pressure conditions. The Fleece Performance Coolant Bypass Kit is one of the most important upgrades you can make to protect the reliability and longevity of your Cummins engine.\u003c\/p\u003e","brand":"XDP","offers":[{"title":"Default Title","offer_id":55237254119716,"sku":"FPE-CLNTBYPS-CUMMINS-0607-SS","price":379.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/7202\/8708\/files\/fpe-clntbyps-cummins-0607-ss_1.jpg?v=1782233439","url":"https:\/\/autodieselsystems.com\/products\/fleece-performance-coolant-bypass-kit-stainless-steel-hose-5-9-6-7l-cummins","provider":"Auto Diesel Systems","version":"1.0","type":"link"}