Gates 18021 HVAC Heater Hose

Gates Molded Heater Hose 18021 Overview

The Gates 18021 molded heater hose is an OEM-style coolant hose built for tight engine bays and factory routing. With a small 8 mm inside diameter at both ends and a 396 mm centerline length, it supports precise fitment in heater, coolant, water, and air applications.

Compatible With select Honda, Toyota, Acura, Nissan, Hyundai, Kia, Lexus, Mazda, and Mitsubishi applications, this molded hose follows the shape needed for crowded engine compartments. The Gates Molded Heater Hose line is made for direct-routing replacement where a straight hose will not match the original path.

Key Features

• Gates Molded Heater Hose, part number 18021
• Factory-molded, OE-style shape for tighter engine compartments
• EPDM construction for coolant and heater service
• 8 mm inside diameter at both ends
• 396 mm centerline length for routed applications
• Approved for marine applications
• Cross-reference example: Bosch 18021

Product Details

This molded coolant hose is built to replace formed heater hose routing where exact bends matter. The EPDM material is suited for coolant transfer and other fluid or air routing needs, while the molded profile helps maintain the original hose path in applications such as a 1994-2001 Acura Integra intake manifold to pipe-1, a 1991-1995 Toyota MR2 engine to pipe-3, or a 1999-2001 Honda CR-V pipe-3 to pipe-4. The Gates 18021 is also listed for vehicles including the 2002-2005 Hyundai XG350 and 2004 Kia Amanti in throttle-body-related coolant routing.

What It Helps Address

• Cracked or hardened molded heater hose sections
• Coolant leaks at formed hose routing points
• Incorrect hose shape after prior repairs
• Restricted fitment in compact engine compartments
• Replacement needs for heater, coolant, water, or air routing

Installation Notes and Tips

Verify end diameter, centerline length, and routing before installation. This hose is molded, so compare the original bend profile and connection points on the vehicle before removal. Confirm the exact application for your Honda Civic del Sol, Toyota 4Runner, or Acura Integra by matching the listed position and hose path. Use proper coolant service procedures and inspect adjoining clamps, pipes, and fittings for wear before reassembly.

Quality Assurance

Gates Molded Heater Hose products are built to OE-style dimensions and routing requirements for service replacement use. Part number 18021 is listed across multiple interchange references and vehicle applications for consistent fit verification.