Keep hot coolant flowing to the heater core with the GATES heater hose 12399, a factory-molded, OEM-style molded heater hose that installs as a direct-fit replacement on the 2006-2010 Ford Explorer, 2007-2010 Ford Explorer Sport Trac, and 2006-2010 Mercury Mountaineer — see the Buyer's Guide tab for engine-level fitment. This is the heater hose for the right-side (HEATER - RIGHT SIDE) position. As a GATES molded heater hose, its pre-formed shape is built to fit today's smaller, tighter engine compartments and follow the factory routing.
Small I.D. molded design: factory-molded to route cleanly in tight spaces; suitable for coolant, water and air applications and also approved for marine use.
Durable construction: EPDM tube, synthetic fiber knit reinforcement, and EPDM cover, engineered to resist electrochemical degradation — a leading cause of hose failure.
Rated to spec: meets SAE 20R3 Type EC Class D-1 and D-2 specifications, with a temperature range of -40°F to 275°F (-40°C to 135°C).
Caution: do not use for fuel or oil transfer applications. Gates recommends replacing the hose clamps each time a new coolant hose is installed.
Interchange: 6L24 18C553 HA · 6L2Z 18C553 E · 6L2Z 18C553 H
6L2418C553HA · 6L2Z18C553E · 6L2Z18C553H · F10612 · 13399
This part cross-references / interchanges with the following part numbers:
F10612, 6L24 18C553 HA, 6L2Z 18C553 E, 6L2Z 18C553 H, 12399, 13399
