Keep coolant moving through your BMW's cooling circuit with the Gates HVAC Heater Hose 51738, a molded coolant hose that routes between the water pump and thermostat. It's a direct-fit replacement for a wide range of 2006-2013 BMW models — including the 2008-2013 128I, the 2006 325I and 325XI, the 2007-2013 328I, the 2006-2007 525I and 530I, the 2007-2010 X3 and X5, and the 2006-2008 Z4 — so see the Buyer's Guide tab for the full list of covered vehicles and engines.
- Position: connects the water pump to the thermostat in the engine cooling circuit.
- Function: carries engine coolant along its routing, helping maintain flow for proper operating temperature.
- Direct fit: a direct-fit replacement for the listed BMW applications.
Rubber coolant hoses harden, crack, swell, or weep with age and heat cycling. Signs this hose may need replacing include visible coolant seepage or drips near the pump-to-thermostat run, a soft or bulging hose, or low coolant. If a failed hose is the cause of your leak, this replaces it — diagnose the source before installing.
Interchange: 20850S · 11537521049 · F10414 · R19568 · CHE0409 · CHE0497. Manufacturer part number 51738.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Where does this hose connect on the engine?
It routes between the water pump and the thermostat in the engine cooling circuit, carrying coolant along that section of the system.
Will this fit my BMW?
It's a direct-fit replacement for many 2006-2013 BMW models, including the 128I, 325I, 328I, 525I, 530I, X3, X5, and Z4. Check the Buyer's Guide tab for your exact year and engine.
What does this hose do?
It carries engine coolant between the water pump and thermostat, helping maintain proper flow so the engine reaches and holds its normal operating temperature.
How do I know if my heater hose needs replacing?
Look for coolant seepage or drips near the hose, a soft, swollen, or cracked hose, or unexplained coolant loss. Diagnose the leak source before replacing.
What numbers does this hose interchange with?
It cross-references 20850S, 11537521049, F10414, R19568, CHE0409, and CHE0497. The manufacturer part number is Gates 51738.
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