Dayco 72385 Engine Coolant Bypass Hose - Thermostat To Water Pump

Dayco Curved Radiator Hose 72385

Dayco 72385 is an engine coolant bypass hose in the Curved Radiator Hose line, built for thermostat-to-water-pump routing in select Ford, Lincoln, Mercury, and Mazda applications. It uses EPDM construction and a single I.D. hose design to match the cooling system path and dimensions required for the listed vehicles.

Key Features

• EPDM rubber construction for coolant-system service
• Black finish with a curved hose profile
• 1 1/2 in. inside diameter at both ends
• Single I.D. hose design
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco part number 72385 for direct catalog lookup

Product Details

This Dayco Curved Radiator Hose is specified as an engine coolant bypass hose for the thermostat-to-water-pump circuit. The 1 1/2 in. end diameters and curved shape support the routing used on 2006-2012 Ford Fusion, 2007-2012 Lincoln MKZ, 2006-2009 Mercury Milan, 2005-2008 Ford Escape, 2003-2008 Mazda 6, 2008 Mazda Tribute, and 2006 Lincoln Zephyr. Dayco 72385 is also cross-referenced with Motorcraft KH337 for the same application.

What It Helps Address

• Coolant hose leakage at the thermostat-to-water-pump circuit
• Cracking, hardening, or swelling in an aging bypass hose
• Incorrect hose routing on curved cooling-system runs
• Loss of coolant flow through the bypass path
• Fitment issues when replacing an OE-style molded hose

Installation Notes and Tips

Verify the thermostat-to-water-pump routing and confirm both hose ends measure 1 1/2 in. inside diameter before installation. Compare the original hose shape and length to the replacement to ensure proper alignment in the engine bay. This hose is listed for the specified Ford Fusion, Lincoln MKZ, Mercury Milan, Ford Escape, Mazda 6, Mazda Tribute, and Lincoln Zephyr applications.

Quality Assurance

Dayco builds this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for coolant-hose service. The EPDM material is selected for use in engine cooling systems where temperature and coolant exposure are part of normal operation.