Gates 19937 Molded Heater Hose

The Gates 19937 Molded Heater Hose is a precision-engineered coolant transfer hose designed for reliable performance in automotive heating systems. Factory-molded to provide an exact fit for specific applications, this heater hose delivers hot coolant from the engine to the heater core and back, ensuring efficient cabin heating and optimal engine temperature management.

Constructed with a durable EPDM (ethylene propylene diene monomer) rubber tube and synthetic fiber reinforcement, this hose is engineered to resist electrochemical degradation (ECD)—the leading cause of heater hose failure. The EPDM compound remains unaffected by most coolants, non-oil based coolant additives, and high cooling system pressures, providing long-lasting service life. The heat and ozone-resistant EPDM cover protects against environmental factors and maintains flexibility even after extended exposure to engine heat.

This molded heater hose features a pre-shaped design that eliminates the need for forcing straight hose into tight bends, ensuring proper routing and reducing installation time. The precision molding guarantees a secure fit with factory-like appearance and performance. Meets SAE 20R3 EC Class D-2 specifications for heater hose applications, with an operating temperature range of -40°F to +275°F (-40°C to +135°C).

Key Features:

• Pre-shaped molded design for exact fit and easy installation
• EPDM construction resists electrochemical degradation and coolant deterioration
• Synthetic fiber reinforcement for strength and durability
• Heat and ozone-resistant cover withstands harsh engine environments
• Operating temperature range: -40°F to +275°F
• Meets SAE 20R3 EC Class D-2 specifications
• Compatible with most coolants and non-oil based coolant additives
• Not for use with fuel or oil applications

Installation Note: Gates recommends replacing hose clamps each time a new heater hose is installed to ensure a proper seal and prevent coolant leaks.