{"product_id":"wehrli-wcf100742-2017-2019-gm-l5p-duramax-upper-coolant-pipe","title":"Wehrli 17-19 Chevrolet 6.6L L5P Duramax Upper Coolant Pipe - Illusion Purple","description":"\u003ch4\u003eStop Fighting A Factory Rubber Hose That Was Never Built To Last\u003c\/h4\u003e\n\u003cp\u003eThe OEM upper coolant hose on the L5P Duramax is a known weak point that softens, cracks, and eventually fails under sustained boost and heat cycling. The Wehrli WCF100742 replaces that factory rubber section with a mandrel bent aluminum pipe finished in Illusion Purple powder coat, giving your cooling system a permanent upgrade instead of a wear item that needs replacing again down the road.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eMandrel bent aluminum construction replaces the failure prone OEM rubber upper coolant hose\u003c\/li\u003e\n\u003cli\u003eIllusion Purple powder coat finish with WCFab logo tag for a finished underhood look\u003c\/li\u003e\n\u003cli\u003eDirect replacement for GM part number 84094878 on 2017 to 2019 L5P Duramax trucks\u003c\/li\u003e\n\u003cli\u003eShips complete with silicone boots and T-bolt clamps for a proper factory style seal\u003c\/li\u003e\n\u003cli\u003eDesigned to work with the OEM GM radiator for a bolt in fit without cutting or splicing\u003c\/li\u003e\n\u003cli\u003eEliminates a common source of coolant seepage and hose collapse under heat cycling\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eTrim\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 2500HD\u003c\/td\u003e\n\u003ctd\u003eWork Truck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 2500HD\u003c\/td\u003e\n\u003ctd\u003eLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 2500HD\u003c\/td\u003e\n\u003ctd\u003eLTZ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 2500HD\u003c\/td\u003e\n\u003ctd\u003eHigh Country\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 3500HD\u003c\/td\u003e\n\u003ctd\u003eWork Truck\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 3500HD\u003c\/td\u003e\n\u003ctd\u003eLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 3500HD\u003c\/td\u003e\n\u003ctd\u003eLTZ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet\u003c\/td\u003e\n\u003ctd\u003eSilverado 3500HD\u003c\/td\u003e\n\u003ctd\u003eHigh Country\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eSierra 2500HD\u003c\/td\u003e\n\u003ctd\u003eSLE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eSierra 2500HD\u003c\/td\u003e\n\u003ctd\u003eSLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eSierra 2500HD\u003c\/td\u003e\n\u003ctd\u003eDenali\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eSierra 3500HD\u003c\/td\u003e\n\u003ctd\u003eSLE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eSierra 3500HD\u003c\/td\u003e\n\u003ctd\u003eSLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eGMC\u003c\/td\u003e\n\u003ctd\u003eSierra 3500HD\u003c\/td\u003e\n\u003ctd\u003eDenali\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eFitment applies to trucks equipped with the 6.6L L5P Duramax Turbo Diesel V8. Confirm your engine option before ordering, since the L5P was only offered as an upgrade over the standard gas V8 on these model years.\u003c\/p\u003e\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eWCF100742\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eWehrli Custom Fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eNot published by manufacturer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eIllusion Purple powder coat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReplaces GM Part Number\u003c\/td\u003e\n\u003ctd\u003e84094878\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e4.0 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e6 in W x 6 in H x 24 in L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRadiator Compatibility\u003c\/td\u003e\n\u003ctd\u003eOEM GM radiator required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eMade in the USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1 aluminum upper coolant pipe in Illusion Purple powder coat\u003c\/li\u003e\n\u003cli\u003e2 silicone boots\u003c\/li\u003e\n\u003cli\u003e4 T-bolt clamps\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAbout Wehrli Custom Fabrication\u003c\/h4\u003e\n\u003cp\u003eWehrli Custom Fabrication builds Duramax specific intake, cooling, and piping upgrades out of its Illinois shop, with every coolant pipe and intercooler pipe mandrel bent and finished in house. The brand is a mainstay in the diesel truck community for parts that solve real factory weak points instead of chasing horsepower numbers alone.\u003c\/p\u003e\n\u003ch4\u003eRelated Parts on Our Site\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/wehrli\"\u003eShop all Wehrli Custom Fabrication parts\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cstrong\u003eWhat is the WCF100742?\u003c\/strong\u003e\n\u003cp\u003eThe WCF100742 is a Wehrli Custom Fabrication aluminum upper coolant pipe built for 2017 to 2019 GM trucks with the 6.6L L5P Duramax. It replaces the factory rubber upper coolant hose with a mandrel bent aluminum pipe and ships with silicone boots and T-bolt clamps for installation.\u003c\/p\u003e\n\u003cstrong\u003eDoes the WCF100742 fit the 2020 and newer L5P Duramax?\u003c\/strong\u003e\n\u003cp\u003eNo. The WCF100742 is built specifically for 2017 to 2019 trucks. Wehrli produces a separate upper coolant pipe for 2020 and later L5P trucks since the routing and boot shape changed for that generation.\u003c\/p\u003e\n\u003cstrong\u003eWill this pipe work with an aftermarket radiator?\u003c\/strong\u003e\n\u003cp\u003eWehrli designs this pipe to work with the factory GM radiator. Aftermarket radiators can shift hose routing and clamp positioning enough to cause fitment issues, so confirm compatibility before installing on a truck with a non OEM radiator.\u003c\/p\u003e\n\u003cstrong\u003eWhat GM part number does this pipe replace?\u003c\/strong\u003e\n\u003cp\u003eIt replaces GM part number 84094878, which is the factory rubber upper coolant hose that runs between the radiator and the thermostat housing on the L5P Duramax.\u003c\/p\u003e\n\u003cstrong\u003eDoes the kit come with the boots and clamps needed for installation?\u003c\/strong\u003e\n\u003cp\u003eYes. Every kit ships with two silicone boots and four T-bolt clamps so you have everything needed to complete the swap without sourcing extra hardware.\u003c\/p\u003e\n\u003cstrong\u003eCan I install this pipe myself without a lift?\u003c\/strong\u003e\n\u003cp\u003eMost owners complete the swap in a driveway with basic hand tools. The job involves draining a portion of coolant, removing the factory hose at the radiator and thermostat housing, and clamping in the new pipe, typically in under an hour.\u003c\/p\u003e\n\u003cstrong\u003eWhy does the factory rubber hose fail on the L5P Duramax?\u003c\/strong\u003e\n\u003cp\u003eThe factory hose is a rubber section that sits close to heat sources and cycles through repeated expansion and contraction. Over time it can soften, crack, or collapse internally, which restricts coolant flow and can lead to overheating under load.\u003c\/p\u003e\n\u003cstrong\u003eIs this pipe available in colors other than Illusion Purple?\u003c\/strong\u003e\n\u003cp\u003eWehrli offers the WCF100742 in several powder coat finishes. This specific listing is the Illusion Purple finish; check the brand's other listings for alternate color options.\u003c\/p\u003e\n\u003ch4\u003eInstall Instructions\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eAllow the engine to cool completely before starting, ideally overnight.\u003c\/li\u003e\n\u003cli\u003eSlowly remove the cooling system cap to relieve any residual pressure.\u003c\/li\u003e\n\u003cli\u003eDrain about one gallon of coolant into a clean container from the radiator drain on the passenger side lower corner.\u003c\/li\u003e\n\u003cli\u003eLoosen the clamp on the factory upper radiator hose at the radiator and remove the hose.\u003c\/li\u003e\n\u003cli\u003eRepeat at the thermostat housing to fully remove the factory hose from the truck.\u003c\/li\u003e\n\u003cli\u003eInstall the silicone boots onto both ends of the new aluminum pipe and loosely fit the T-bolt clamps at the radiator and thermostat housing.\u003c\/li\u003e\n\u003cli\u003eSlide the pipe into the boots at both ends, then align the boots and clamps for proper logo placement and clamp access.\u003c\/li\u003e\n\u003cli\u003eTighten all T-bolt clamps, refill the cooling system, and start the truck to bring it to normal operating temperature.\u003c\/li\u003e\n\u003cli\u003eCheck closely for leaks before driving and retighten any clamps as needed.\u003c\/li\u003e\n\u003cli\u003eRecheck the coolant level and all clamps after the first few heat cycles to confirm a leak free installation.\u003c\/li\u003e\n\u003c\/ol\u003e\n","brand":"Wehrli","offers":[{"title":"Default Title","offer_id":46319889252431,"sku":"WCFWCF100742-IP","price":184.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/wcf100742-wehrli-l5p-duramax-upper-coolant-pipe-17-19.png?v=1785503015","url":"https:\/\/www.blackopsautoworks.com\/products\/wehrli-wcf100742-2017-2019-gm-l5p-duramax-upper-coolant-pipe","provider":"Black Ops Auto Works","version":"1.0","type":"link"}