Gates 18420 HVAC Heater Hose - Heater To Valve or Transmission Oil Cooler To Pipe-1

Gates 18420 Molded Heater Hose Overview

The Gates 18420 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a straight hose will not route correctly. With a factory-molded shape and 13 mm (0.5 in) inside diameter at both ends, it supports coolant, water, and air transfer in select applications, including marine use.

Gates Molded Heater Hose line focuses on formed replacement hoses that match the routing needs of modern vehicles. This part number, 18420, is shaped for specific heater and coolant paths in vehicles such as the Honda Prelude and Toyota RAV4.

Key Features

• Gates molded heater hose, part number 18420
• EPDM construction for coolant and heater hose service
• Factory-molded profile for tight engine bay routing
• 13 mm (0.5 in) inside diameter at both ends
• 8.5 in (216 mm) centerline length
• Suitable for coolant, water, and air applications
• Approved for marine applications

Detailed Description

Gates 18420 is a molded HVAC heater hose designed to replace formed coolant hose routing where space is limited. The EPDM construction and OEM-style bend help maintain proper hose alignment in compact engine compartments, reducing the need to force a universal hose into a shaped path. This makes it a direct-fit style solution for applications such as 1983-1987 Honda Prelude heater to valve routing and 2004-2005 Toyota RAV4 transmission oil cooler to pipe-1 routing. If you are searching for a molded heater hose for a Honda Prelude or a Toyota RAV4 coolant line, part number 18420 is the correct reference to verify.

This part cross-references Four Seasons 63322 for the same application.

Common Problems This Hose Can Address

• Cracked or hardened heater hose material
• Incorrect hose routing in tight engine compartments
• Leaks at a formed coolant or heater hose section
• Collapsed or misshaped hose bends from age and heat
• Replacement needs for select Honda Prelude and Toyota RAV4 hose paths

Installation Notes and Tips

Verify end diameter, centerline length, and molded shape against the original hose before installation. Confirm the routing path on the vehicle, especially on 1983-1987 Honda Prelude heater to valve and 2004-2005 Toyota RAV4 transmission oil cooler to pipe-1 applications. Inspect adjoining pipes, clamps, and fittings for wear or corrosion before installing Gates 18420.

Quality Assurance

Gates is known for OE-style replacement hose construction, and this molded heater hose is built to match the fit and routing demands of specific factory applications. Part number 18420 is made to support reliable hose replacement where a formed hose is required.