{"product_id":"4h0-121-671-d-genuine-vw-audi-coolant-control-solenoid-valve","title":"4H0-121-671-D Genuine VW\/Audi Coolant Control Solenoid Valve","description":"\u003cp\u003e\u003cstrong\u003eGenuine VW\/Audi coolant control solenoid valve, part number 4H0-121-671-D.\u003c\/strong\u003e This electrically operated valve controls coolant flow in its assigned hose circuit. Correct operation helps the vehicle manage coolant circulation and cabin heating according to the factory system design.\u003c\/p\u003e\u003ch3\u003eTechnical details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOriginal part number: \u003cstrong\u003e4H0-121-671-D\u003c\/strong\u003e \/ 4H0121671D.\u003c\/li\u003e\n\u003cli\u003eCoolant hose valve with electrical connector, two hose connections and mounting tabs, as shown in the original photos.\u003c\/li\u003e\n\u003cli\u003eCatalog names include coolant solenoid valve, water hose valve and heater control valve.\u003c\/li\u003e\n\u003cli\u003eReplaces 4H0-121-671-B where the original valve assignment calls for this replacement.\u003c\/li\u003e\n\u003cli\u003eSupplied as one valve. Hoses, clamps, coolant and mounting hardware are separate.\u003c\/li\u003e\n\u003cli\u003eThis is a coolant flow control valve. Match its exact circuit location and original part number rather than identifying it solely by appearance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCommon reasons to replace\u003c\/h3\u003e\u003cp\u003eReplace the valve when testing confirms a failure to operate, an electrical fault or leakage from the valve body. Reduced heater output or coolant loss can warrant inspection, but those symptoms also have other causes in the cooling and climate systems.\u003c\/p\u003e\u003cp\u003eFactory service information identifies coolant leakage into the electrical connector as an important inspection point. Coolant can travel into the wiring and damage connectors or connected electronics. Inspect for moisture, residue and corrosion; replacing the valve alone will not repair wiring that has already been affected.\u003c\/p\u003e\u003ch3\u003eInstallation and service notes\u003c\/h3\u003e\u003cp\u003eLet the cooling system cool completely before opening it. Identify the failed valve and record its hose routing, flow markings and connector orientation. Protect the connector from spilled coolant and inspect the surrounding hoses, clamps and mounting points.\u003c\/p\u003e\u003cp\u003eInstall the replacement in the assigned orientation and follow the vehicle-specific cooling-system filling and bleeding procedure. Use the specified coolant, verify hose security and check for leaks and heater operation after service. Perform the applicable diagnostic checks when a circuit fault was present.\u003c\/p\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eVehicle\u003c\/th\u003e\n\u003cth\u003eModel years\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eValve assignment\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi A3\u003c\/td\u003e\n\u003ctd\u003e2015\u003c\/td\u003e\n\u003ctd\u003e1.8L turbo gasoline\u003c\/td\u003e\n\u003ctd\u003eFront-wheel-drive sedan or Cabriolet; cooling hose solenoid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi A3 quattro\u003c\/td\u003e\n\u003ctd\u003e2015\u003c\/td\u003e\n\u003ctd\u003e2.0L turbo gasoline\u003c\/td\u003e\n\u003ctd\u003eEngine CNTC; sedan or Cabriolet; cooling hose solenoid\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi Q3\u003c\/td\u003e\n\u003ctd\u003e2015–2018\u003c\/td\u003e\n\u003ctd\u003e2.0L turbo gasoline\u003c\/td\u003e\n\u003ctd\u003eFirst-generation front-wheel-drive model; matching water-hose valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi Q3 quattro\u003c\/td\u003e\n\u003ctd\u003e2015–2018\u003c\/td\u003e\n\u003ctd\u003e2.0L turbo gasoline\u003c\/td\u003e\n\u003ctd\u003eFirst-generation quattro model; matching water-hose valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi A6 quattro\u003c\/td\u003e\n\u003ctd\u003e2012–2018\u003c\/td\u003e\n\u003ctd\u003e3.0L supercharged V6 gasoline\u003c\/td\u003e\n\u003ctd\u003eGasoline model; original coolant valve assignment must match\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eConfirm the original valve number and coolant hose circuit before ordering.\u003c\/em\u003e\u003c\/p\u003e","brand":"Genuine VW\/Audi","offers":[{"title":"Default Title","offer_id":48001419804849,"sku":"4H0-121-671-D","price":221.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0681\/1379\/3201\/files\/4h0-121-671-d-genuine-vw-audi-coolant-valve-01.png?v=1790991679","url":"https:\/\/hstuning.com\/products\/4h0-121-671-d-genuine-vw-audi-coolant-control-solenoid-valve","provider":"HS Tuning ","version":"1.0","type":"link"}