{"product_id":"dorman-904-378-diesel-exhaust-fluid-def-heater","title":"Dorman 904-378 Diesel Exhaust Fluid (DEF) Heater","description":"\u003ch2\u003eReliable Diesel Exhaust Fluid Heater for Volkswagen Passat\u003c\/h2\u003e\u003cp\u003eThe Dorman 904-378 Diesel Exhaust Fluid (DEF) Heater is designed specifically for Volkswagen Passat models to ensure optimal DEF system performance in cold conditions. This DEF heater helps maintain fluid temperature, preventing crystallization and ensuring proper emission control.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInside diameter of 115 mm for precise fitment\u003c\/li\u003e\n\u003cli\u003eIncludes two electrical connectors with male and female terminals\u003c\/li\u003e\n\u003cli\u003eMounting hardware included for straightforward installation\u003c\/li\u003e\n\u003cli\u003eDurable black plastic housing measuring 150 mm in height\u003c\/li\u003e\n\u003cli\u003eFemale inlet and outlet fittings for secure hose connections\u003c\/li\u003e\n\u003cli\u003eResistor-type level sensor integrated\u003c\/li\u003e\n\u003cli\u003eMultiple wire colors (black, white, yellow, blue, red, gray) with plastic insulation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details and Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman 904-378 DEF Heater is engineered with a plastic housing that offers durability while maintaining a lightweight design. Its specific fitment for Volkswagen Passat models ensures compatibility and reliable operation within the vehicle’s emission control system. The heater features two electrical connectors with both male and female terminals, supporting three to four terminal connections, which facilitates seamless integration with the vehicle’s wiring harness. The heater’s inlet and outlet fittings are female type, designed to connect securely with the DEF system hoses (hose not included). The resistor-type level sensor helps monitor fluid levels accurately, contributing to efficient system management.\u003c\/p\u003e\u003ch2\u003ePurpose and Common Applications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePrevents DEF crystallization in cold weather conditions\u003c\/li\u003e\n\u003cli\u003eMaintains proper DEF fluid temperature for emission compliance\u003c\/li\u003e\n\u003cli\u003eSupports reliable operation of the vehicle’s selective catalytic reduction (SCR) system\u003c\/li\u003e\n\u003cli\u003eHelps avoid DEF system faults and warning lights\u003c\/li\u003e\n\u003cli\u003eEnsures consistent engine performance and reduced emissions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Dorman 904-378 DEF Heater is straightforward with included mounting hardware. Ensure the heater is installed in the correct orientation with female inlet and outlet fittings properly connected to the DEF lines. Verify electrical connectors match the vehicle’s wiring harness terminals (male and female) and confirm secure connections to prevent electrical issues. It is recommended to inspect the DEF lines and connectors for damage during installation and replace any worn components to maintain system integrity.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman parts are manufactured to meet or exceed OEM standards, providing reliable performance for emission control components. The 904-378 DEF Heater undergoes rigorous quality checks to ensure durability and functionality. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship, supporting confidence in the product’s longevity and fitment for Volkswagen Passat vehicles.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":44327363018933,"sku":"BKKY-904-378","price":330.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RB_904378_Fro.jpg?v=1775011786","url":"https:\/\/www.partcatalog.com\/products\/dorman-904-378-diesel-exhaust-fluid-def-heater","provider":"PartCatalog","version":"1.0","type":"link"}