{"product_id":"n-909-450-02-genuine-vw-audi-thermostat-housing-bolt-m7-x-21-5","title":"N-909-450-02 Genuine VW\/Audi Thermostat Housing Bolt - M7 x 21.5","description":"\u003cp\u003e\u003cstrong\u003eGenuine VW\/Audi thermostat housing bolt, part number N-909-450-02.\u003c\/strong\u003e This original fastener secures the thermostat housing at its specified engine attachment at its assigned mounting position on the configurations below. One bolt is supplied.\u003c\/p\u003e\u003ch3\u003eTechnical details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOriginal number: N-909-450-02 \/ N90945002.\u003c\/li\u003e\n\u003cli\u003ePublished nominal size: M7 x 21.5.\u003c\/li\u003e\n\u003cli\u003eCombined external hex and internal hex drive with a flanged head.\u003c\/li\u003e\n\u003cli\u003eApplication: specified thermostat housing mounting position on the confirmed BPY FSI and AWP 1.8T cooling arrangements.\u003c\/li\u003e\n\u003cli\u003eThermostat housing, seals, hoses and other bolts are separate.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe housing fasteners hold the thermostat assembly at the engine connection while the specified seals retain coolant. Correct bolt length and seating are necessary for the designed attachment. Other fasteners in the same assembly can have different lengths; match the part number and position before ordering.\u003c\/p\u003e\u003cp\u003eThis is mounting hardware. It does not regulate coolant temperature or replace the thermostat's sealing components. The FSI attachment differs from the thermostat-to-water-pump arrangement used on TSI engines, so engine identification matters even when the vehicle model is the same.\u003c\/p\u003e\u003ch3\u003eCommon reasons to replace\u003c\/h3\u003e\u003cp\u003eInspect the bolt during thermostat housing removal, replacement or seal service. Replace missing hardware, stripped threads, rounded drive surfaces, deformation or corrosion that prevents proper installation. Follow any factory requirement to renew removed fasteners.\u003c\/p\u003e\u003cp\u003ePrevious cooling system repairs can leave a mismatched length or a damaged bolt. Check the full mounting arrangement before assembly. A fastener that bottoms out before the housing seats cannot establish the intended connection.\u003c\/p\u003e\u003cp\u003eCoolant loss, slow warm-up or abnormal operating temperature requires diagnosis of the cooling system. A new bolt cannot repair a cracked housing, failed thermostat, damaged seal, stripped mating threads or a leak elsewhere in the circuit. Replace or repair the diagnosed component as required.\u003c\/p\u003e\u003ch3\u003eInstallation and service notes\u003c\/h3\u003e\u003cp\u003eFollow the factory thermostat procedure for the exact engine and cooling arrangement. Allow the engine to cool before opening the system, then perform the prescribed coolant draining and access steps. Keep contamination out of open coolant connections.\u003c\/p\u003e\u003cp\u003eIdentify the assigned housing-to-engine position and compare the removed bolt with N90945002. Inspect the housing, mounting surfaces and mating threads. Select the specified sealing components separately and install them according to the repair procedure.\u003c\/p\u003e\u003cp\u003ePosition the housing correctly and start the bolt by hand in undamaged threads. Do not use a fastener to draw a misaligned housing into place or overcome resistance from an incorrectly seated seal. Check that each mounting position receives its prescribed bolt.\u003c\/p\u003e\u003cp\u003eUse the correct tool for the combined hex head and follow the factory tightening sequence and requirement for this attachment. Observe the prescribed thread preparation and replacement instructions. Do not transfer a torque value from another M7 bolt or a different thermostat design.\u003c\/p\u003e\u003cp\u003eIf the bolt does not seat normally, check the selected length, thread engagement and housing alignment before continuing. Additional force does not repair damaged threads or correct an incorrectly installed housing.\u003c\/p\u003e\u003cp\u003eRefill with the specified coolant and perform the required bleeding, operating-temperature and leak checks. Confirm normal system operation after service. This listing supplies one original bolt; obtain the housing, seals and remaining cooling service components separately.\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\u003eConfiguration\u003c\/th\u003e\n\u003cth\u003eApplication restrictions\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\u003e2006–2008\u003c\/td\u003e\n\u003ctd\u003e2.0L turbocharged FSI gasoline, BPY only\u003c\/td\u003e\n\u003ctd\u003e8P hatchback, front-wheel drive; 6-speed manual\u003c\/td\u003e\n\u003ctd\u003eBPY FSI thermostat housing-to-engine attachment requiring N90945002. Match the exact bolt position and housing. Not the TSI thermostat-to-water-pump fastener.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAudi A3\u003c\/td\u003e\n\u003ctd\u003e2006–2008\u003c\/td\u003e\n\u003ctd\u003e2.0L turbocharged FSI gasoline, BPY only\u003c\/td\u003e\n\u003ctd\u003e8P hatchback, front-wheel drive; 6-speed DSG\u003c\/td\u003e\n\u003ctd\u003eBPY FSI thermostat housing-to-engine attachment requiring N90945002. Match the exact bolt position and housing. Not the TSI thermostat-to-water-pump fastener.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolkswagen GTI 1.8T\u003c\/td\u003e\n\u003ctd\u003e2004–2005\u003c\/td\u003e\n\u003ctd\u003e1.8L turbocharged gasoline, AWP\u003c\/td\u003e\n\u003ctd\u003eMk4 hatchback, front-wheel drive; 5-speed manual\u003c\/td\u003e\n\u003ctd\u003eOriginal thermostat housing mounting screw N90945002, M7 x 21.5. Confirm original number and assigned housing position; adjacent bolts differ.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eConfirm the engine configuration and original N90945002 at the specified thermostat housing mounting position. One bolt supplied.\u003c\/em\u003e\u003c\/p\u003e","brand":"Genuine VW\/Audi","offers":[{"title":"Default Title","offer_id":48008313438385,"sku":"N-909-450-02","price":8.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0681\/1379\/3201\/files\/n-909-450-02-genuine-vw-audi-1.jpg?v=1791336766","url":"https:\/\/hstuning.com\/products\/n-909-450-02-genuine-vw-audi-thermostat-housing-bolt-m7-x-21-5","provider":"HS Tuning ","version":"1.0","type":"link"}