Rein CHS0646 Engine Coolant Hose Flange Kit

Coolant Flange Replacement Kit for Audi A4

Rein CHS0646 is an OE-quality coolant flange replacement kit for servicing the cylinder head coolant junction on select Audi applications. It combines the main cooling-system wear items into one repair, helping restore a leaking or deteriorated flange assembly with direct-fitting components.

Compatible with 2002-2006 Audi A4 and 2002-2005 Audi A4 Quattro, this kit is built for a focused cooling system repair on vehicles that use a plastic coolant flange, thermostat, and quick-connect hose layout.

Key Features

• Comprehensive kit for a single cooling system repair
• OE-type virgin resin coolant flange for direct replacement
• OE-type heater and/or radiator hose(s)
• OE-type thermostat assembly
• Includes temperature sensor, gaskets, and/or seals as listed in the product description
• Rein CHS0646 cross-references Genuine 06B121132E for the same application

Detailed Description

Rein CHS0646 coolant flange replacement kit is built to address common failure points in the cooling system around the cylinder head coolant junction. Repeated heat cycling can deform the original plastic flange and lead to coolant loss, so this kit replaces the flange with a virgin OE-type resin part and includes matching OE-style hose components with quick-connect ends. The kit also covers the thermostat-related service items needed for a more complete repair.

For Audi A4 and Audi A4 Quattro models in the listed fitment range, CHS0646 provides a practical way to service the flange area without piecing together separate parts. Rein CHS0646 is intended for technicians and owners performing a coolant flange replacement on 2002-2006 Audi A4 and 2002-2005 Audi A4 Quattro vehicles.

What This Repair Can Address

• Coolant leaking from the flange area
• Cracked or warped plastic coolant junction flange
• Swollen or deteriorated coolant hoses
• Thermostat-related cooling system service
• Temperature sensor and sealing component replacement during flange repair

Installation Notes and Tips

Drain the cooling system before removing the flange assembly, and inspect the surrounding hoses, seals, and sensor connections during disassembly. A proper coolant flush is recommended when replacing leaking cooling-system components. Rein recommends OE or Pentosin Pentofrost series coolants for this repair.

Verify engine application and connector style before installation. This kit uses OE-type quick-connect hose end fittings and is intended for direct-fit replacement on the listed Audi A4 and Audi A4 Quattro applications.

Quality Assurance

Rein OE Quality cooling components are built with direct-fitting materials for service-focused repairs. Part number CHS0646 includes a 24-month/24,000-mile warranty.