Rein CHH0442 HVAC Heater Hose - Engine Inlet To Water Valve

OE Quality Heater Hose for BMW Cooling Service

Rein CHH0442 is an OE-quality HVAC heater hose built for European vehicle applications that require a direct-fit replacement. It follows the original hose layout and uses thermoplastic quick connect fittings to match the factory connection points on BMW heater hose routing.

Compatible With 1999-2003 BMW 528i, 525i, and 530i at the engine inlet to water valve position, this Rein heater hose is made for clean service replacement on the BMW cooling and HVAC system.

Key Features

• Direct replacement for OE heater hose and hose assembly applications
• Application-specific fit for BMW 528i, 525i, and 530i heater hose service
• Thermoplastic quick connect fitting included for factory-style connection
• EPDM hose construction for heat and contamination resistance
• Built to SAE J20R4-D2 standards
• Black hose finish with OE-style routing and branch shape
• Rein CHH0442 cross-references Genuine 64218378368 for the same application

Product Details

Rein Automotive OE-quality heater hoses are engineered to match the original hose dimensions, branch geometry, and connector style used on European vehicles. CHH0442 is a single heater hose assembly with a centerline length of 28.38 inches and hose ends sized for the specified BMW cooling circuit connection. The EPDM construction is resistant to heat, salt, road debris, oil, and other common underhood contaminants, helping maintain a secure seal in demanding service conditions. Rein CHH0442 is a direct-fit solution for BMW 528i, 525i, and 530i models where the heater hose runs from the engine inlet to the water valve.

Common Problems This Part Can Address

• Coolant seepage at worn heater hose connections
• Leaks caused by aged or brittle OE hose material
• Fitment issues from universal hoses that require trimming or adapting
• Repeat repairs from reusing old quick connectors or seals
• Slow installation caused by mismatched hose shape or connector style

Installation Notes and Tips

Use this hose on the listed BMW applications only. The direct-fit design reduces installation time and eliminates the need for cutting, refitting, or adjusting the hose. Inspect the mating surfaces, quick connector, and sealing points before installation, and replace any damaged seals or connectors as needed during service. Confirm routing matches the original heater hose path from the engine inlet to the water valve.

Quality Assurance

Rein CHH0442 is built as an OE-quality replacement for European vehicles and manufactured to meet SAE J20R4-D2 requirements. It is backed by a 24-month or 24,000-mile warranty.