Gates 18670 HVAC Heater Hose - Reservoir (Upper)

Gates 18670 Molded Heater Hose Overview

The Gates 18670 molded heater hose is a factory-shaped coolant hose built for tight engine bays where a straight hose will not route correctly. It is made from EPDM and is approved for coolant, water, air, and marine applications.

Compatible With 2002-2007 Subaru Impreza and 2004-2008 Subaru Forester reservoir (upper) applications, this molded heater hose follows the OE-style path for a cleaner, more accurate replacement. Gates Molded Heater Hose line parts are formed to match compact routing needs in modern vehicles.

Key Features

• Gates part number 18670
• Factory-molded, OE-style hose shape
• EPDM construction for coolant-system service
• End 1 inside diameter: 0.44 in. (11 mm)
• End 2 inside diameter: 0.44 in. (11 mm)
• Centerline length: 8.33 in. (212 mm)
• Fits reservoir (upper) heater hose routing on select Subaru models
• Approved for coolant, water, air, and marine use

Detailed Description

Gates 18670 is a molded coolant hose designed for applications that require a precise bend and stable routing in smaller engine compartments. The EPDM material is suited for heater and coolant service, while the molded profile helps maintain the correct hose path in the Subaru Forester and Subaru Impreza reservoir (upper) location. If you are replacing a worn or collapsed hose on a 2002-2007 Subaru Impreza or 2004-2008 Subaru Forester, this part number 18670 provides an OE-style solution that matches the original routing requirements.

This part cross-references CSF 10670 for the same application.

Common Replacement Reasons

• Cracked or hardened heater hose material
• Coolant seepage at the hose body or ends
• Collapsed hose from age or heat cycling
• Poor fitment from a universal hose in a molded location
• Incorrect routing in the reservoir (upper) hose path

Installation Notes and Tips

Verify the hose shape, end diameters, and centerline length before installation. Confirm the routing matches the reservoir (upper) position on the vehicle and inspect adjoining clamps, fittings, and nearby coolant components for wear or contamination. On Subaru Impreza and Subaru Forester applications, proper hose orientation is important to maintain clearance in the engine bay.

Quality Assurance

Gates is a recognized supplier of molded coolant and heater hose products, and this hose is built to OE-style dimensions for accurate replacement service. Part number 18670 is manufactured for fitment-specific use on listed Subaru applications.