Rein 11-53-1-436-410 Coolant Hose Expansion Tank to Water Pipe

The Rein 11-53-1-436-410 is an OE-quality coolant hose designed to connect the water pipe to the expansion tank on BMW E46 3-series vehicles equipped with M52 and M54 engines. This hose serves a critical function in the cooling system by allowing coolant to flow into the expansion tank as the engine warms and the coolant expands, while also providing the fill point for the cooling system.

Key Features:

• Direct OE replacement for BMW part number 11531436410
• Also known as Rein part number CHR0007
• Identical to original equipment specifications including thermoplastic quick-connect fittings
• Manufactured by Rein Automotive, a leading supplier of OE-quality cooling system components for European vehicles
• Includes integrated O-rings for proper sealing to expansion tank and coolant pipe
• Located on the left side of the engine, running past the alternator for easy access

Over time, the rubber in coolant hoses and their sealing O-rings can degrade due to constant exposure to high temperatures and coolant chemicals, leading to leaks that may cause engine overheating. This Rein replacement hose restores your cooling system to proper function with the same quality components used by BMW at the factory. Installation typically takes under an hour.