Gates 19851 HVAC Heater Hose - Oil Cooler To Thermostat

Gates Molded Heater Hose 19851 Overview

The Gates 19851 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a straight hose will not route correctly. Made from EPDM and factory-molded to the proper shape, it supports coolant, water, and air transfer in demanding HVAC and engine cooling applications.

Compatible with select Saab, Chevrolet, and Saturn applications, this molded heater hose is a direct-fit solution for the oil cooler to thermostat routing found on specific vehicles. The Gates 19851 part number is also referenced in interchange listings for related OE-style replacements.

Key Features

• Factory-molded hose shape for tighter engine bay routing
• EPDM construction for coolant and heat resistance
• OEM-style fit for select HVAC and cooling system applications
• Approved for marine applications
• Designed for coolant, water, and air transfer
• Gates 19851 molded heater hose identification for catalog matching

Product Details

The Gates Molded Heater Hose line is built for vehicles that require a formed hose rather than a universal straight section. This hose measures 9.8 inches centerline length, with a 19 mm (0.75 in) end I.D. and a 21 mm (0.82 in) end I.D., helping it match the original routing and connection sizes used in compact engine layouts. The molded EPDM design supports consistent fitment where space is limited and hose alignment matters.

Fits 2003-2011 Saab 9-3, Oil Cooler To Thermostat. Fits 2010-2011 Saab 9-3X, Oil Cooler To Thermostat. Fits 2005-2007 Chevrolet Cobalt, Oil Cooler To Thermostat. Fits 2004-2007 Saturn Ion, Oil Cooler To Thermostat. This part cross-references URO 12786237 for the same application.

Common Uses

• Replacing a cracked or leaking oil cooler to thermostat hose
• Restoring proper coolant flow in the heater and cooling circuit
• Correcting hose routing issues in tight engine compartments
• Addressing soft, swollen, or heat-aged EPDM hose material
• Repairing fitment problems caused by incorrect universal hose bends

Installation Notes

Verify the hose routing, end diameters, and centerline length before installation. This molded hose is intended for the oil cooler to thermostat position on the listed Saab, Chevrolet, and Saturn applications, so confirm the vehicle’s original hose shape and connection points before removal. Inspect adjoining clamps, fittings, and mating surfaces for wear or corrosion during service.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement for precise routing and dependable material performance. The molded construction and EPDM compound reflect the brand’s focus on fit and durability in cooling system service.