{"product_id":"nissens-999231-a-c-expansion-valve","title":"Nissens 999231 A\/C Expansion Valve","description":"\u003ch2\u003eNissens A\/C Expansion Valve 999231\u003c\/h2\u003e\u003cp\u003eNissens 999231 is a block-style A\/C expansion valve built from aluminum for R134A systems. It regulates refrigerant flow through the evaporator circuit to help maintain stable cabin cooling performance in BMW applications.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBlock-type A\/C expansion valve for HVAC refrigerant control\u003c\/li\u003e\n\u003cli\u003eAluminum construction for corrosion resistance and thermal stability\u003c\/li\u003e\n\u003cli\u003eConfigured for R134A refrigerant systems\u003c\/li\u003e\n\u003cli\u003eMounting hardware included\u003c\/li\u003e\n\u003cli\u003eIncludes O-rings and 4 O-rings are listed in the product data\u003c\/li\u003e\n\u003cli\u003eLiquid inlet and outlet thread diameter: 0.5500\u003c\/li\u003e\n\u003cli\u003eSuction inlet thread diameter: 0.7900; suction outlet thread diameter: 0.7100\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eThis Nissens A\/C expansion valve, part number 999231, is engineered for BMW HVAC systems that use a block-style refrigerant metering design. By controlling refrigerant delivery into the evaporator, it supports consistent A\/C operation in models such as the BMW 525i, 530i, 528i, 535i, 550i, 645Ci, 650i, M5, and M6. Nissens develops thermal management components with a focus on quality and ongoing aftermarket coverage, and this valve follows that approach with aluminum construction and R134A compatibility.\u003c\/p\u003e\u003cp\u003eThis part cross-references Febi-Bilstein 39222 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat This Part Helps Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWeak or inconsistent cabin cooling\u003c\/li\u003e\n\u003cli\u003eImproper refrigerant metering at the evaporator\u003c\/li\u003e\n\u003cli\u003eA\/C performance issues caused by a worn expansion valve\u003c\/li\u003e\n\u003cli\u003eRefrigerant flow irregularities in R134A systems\u003c\/li\u003e\n\u003cli\u003eService replacement needs on BMW HVAC systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the vehicle uses the correct block-style expansion valve and R134A refrigerant system before installation. Inspect the mating surfaces, replace worn seals as needed, and confirm the line thread diameters match the existing HVAC connections. Proper evacuation and recharge procedures are required after A\/C service.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNissens positions this component within its thermal management range and manufactures products to consistent aftermarket quality standards. Part number 999231 is built to support reliable HVAC service in the listed BMW applications.\u003c\/p\u003e","brand":"Nissens","offers":[{"title":"Default Title","offer_id":52725015314613,"sku":"BKMH-999231","price":57.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/N1_999231_Fro.jpg?v=1782022731","url":"https:\/\/www.partcatalog.com\/products\/nissens-999231-a-c-expansion-valve","provider":"PartCatalog","version":"1.0","type":"link"}