Gates 18503 HVAC Heater Hose - Transmission Oil Cooler To Housing

Gates 18503 Molded Heater Hose Overview

The Gates 18503 molded heater hose is an OEM-style coolant hose built for tight engine bays and factory routing. It is formed to match the original shape needed for specific Honda Accord and Acura TL applications, helping maintain proper hose alignment in compact HVAC and cooling system layouts.

Made from EPDM, this Gates Molded Heater Hose line is designed for coolant, water, and air service, and it is also approved for marine applications. The small inside diameter and molded construction support a precise fit where straight hose sections are not practical.

Key Features

• Gates part number 18503
• Factory-molded, OEM-style hose shape
• EPDM construction for cooling-system service
• Small I.D. design for tighter engine compartments
• End 1 inside diameter: 13 mm (0.51 in)
• End 2 inside diameter: 13 mm (0.51 in)
• Centerline length: 196 mm (7.7 in)
• Compatible with coolant, water, and air applications
• Approved for marine applications

Product Details

This molded heater hose is part of the Gates Molded Heater Hose product line, which focuses on formed replacement hoses for vehicles with limited underhood space. The Gates 18503 follows the original routing profile needed for transmission oil cooler to housing connections on select Honda Accord and Acura TL models, helping preserve the intended hose path and connection geometry. This part cross-references CSF 10503 for the same application.

Fits 2003-2007 Honda Accord, Transmission Oil Cooler To Housing. Fits 2004-2005 Acura TL, Transmission Oil Cooler To Housing.

Common Problems This Hose Can Help Address

• Cracked or hardened molded coolant hose material
• Leaks at a formed hose connection point
• Poor hose routing in a tight engine compartment
• Incorrect fitment from a universal straight hose
• Degraded hose performance in coolant, water, or air service

Installation Notes and Tips

Verify the hose routing and connection points against the original part before installation. Because this is a molded hose, correct orientation matters for proper fit in the transmission oil cooler to housing location. Inspect adjoining fittings and clamps for wear or corrosion before reassembly.

Quality Assurance

Gates manufactures this molded hose to OE-style dimensions and material specifications for the listed Honda Accord and Acura TL applications. The EPDM construction and factory-formed shape support consistent replacement fitment in the intended cooling-system routing.