Gates 52003 HVAC Heater Hose - Reservoir (Lower)

Gates 52003 Molded Coolant Hose Overview

The Gates 52003 molded coolant hose is a direct-fit HVAC heater hose for select Ram ProMaster vans. Built from EPDM and plastic, it follows OEM-style routing and integrates the application-specific features needed for the lower reservoir connection.

Compatible with 2014-2021 Ram ProMaster 1500, 2014-2021 Ram ProMaster 2500, and 2014-2021 Ram ProMaster 3500 at the reservoir (lower) position, this molded hose is made for precise fitment on the cooling system side of the HVAC circuit. The Gates 52003 part number is also referenced by Mopar 68214933AC for the same application.

Key Features

• Gates Molded Coolant Hose line for application-specific cooling system routing
• EPDM and plastic construction for use in coolant and heater hose service
• OEM-style molded shape for the lower reservoir connection
• End 1 inside diameter: 17 mm (.68 in)
• End 2 inside diameter: 21 mm (.83 in)
• Centerline length: 1340 mm (52.75 in)
• No spring included
• Direct replacement part number: 52003

Detailed Description

Gates 52003 is a molded coolant hose engineered for Ram ProMaster 1500, Ram ProMaster 2500, and Ram ProMaster 3500 models from 2014 through 2021. As part of Gates’ molded coolant hose line, it is built to match the vehicle-specific layout and includes integrated OE-style features used in modular coolant hose assemblies. That makes it a practical choice when replacing the lower reservoir hose on a Ram ProMaster cooling system.

This hose measures 1340 mm in centerline length and uses 17 mm and 21 mm end inside diameters to match the factory connection points. The Gates 52003 part number is commonly searched alongside Mopar 68214933AC, and it cross-references F11368 for the same application.

Common Problems This Hose Can Address

• Cracked or split lower reservoir hose
• Coolant seepage at molded hose connections
• Heat-related hose hardening or deterioration
• Incorrect fit from universal hose replacements
• Loss of factory-style routing in the HVAC coolant circuit

Installation Notes and Tips

Verify the reservoir (lower) hose routing and connection sizes before installation. Compare the original hose shape, end diameters, and centerline length to confirm the correct replacement for your Ram ProMaster 1500, Ram ProMaster 2500, or Ram ProMaster 3500. Inspect adjoining clamps, connectors, and mating surfaces for wear or contamination before installing the new hose.

Quality Assurance

Gates is a recognized aftermarket supplier of modular coolant hose assemblies, with products built to follow OEM-style specifications for application-specific fitment and integrated components.