Dayco 88447 HVAC Heater Hose

Dayco Small I.D. Heater Hose 88447

Dayco 88447 is a Small I.D. Heater Hose built for HVAC coolant routing where a 3/4 in. inside diameter is required. Made from EPDM and finished in black, it provides a direct-fit hose option for select heater, reservoir filler tee, oil cooler, and pipe-to-valve applications.

The Dayco Small I.D. Heater Hose line focuses on compact coolant connections that need consistent sizing and reliable routing. This 88447 hose follows SAE J20R3 Class D-1 and SAE J1684 Type EC specifications, making it a practical OE-style replacement for service work on vehicles such as the Infiniti FX35, Chevrolet Cobalt, and Saturn Ion.

Key Features

• EPDM construction for heater and coolant hose service
• 3/4 in. inside diameter on both ends
• Black finish for a clean OE-style appearance
• Single I.D. hose design for small-diameter HVAC routing
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Dayco part number 88447 for catalog and cross-reference lookup

Detailed Description

Dayco 88447 is a small inside diameter heater hose used in HVAC and coolant transfer paths where a precise 3/4 in. connection is required. Its EPDM material is selected for heater hose service, and the hose dimensions are consistent at both ends, with an outside diameter of 1 3/32 in. on each side. This makes it a straightforward replacement for routing between tees, pipes, valves, reservoirs, and oil cooler connections.

Compatible With select applications including 2003-2008 Infiniti FX35 heater to tee, 2005-2007 Chevrolet Cobalt engine to reservoir filler tee, 2004-2007 Saturn Ion engine to reservoir filler tee, 1999-2001 Oldsmobile Alero oil cooler to pipe, 1999-2001 Pontiac Grand Am pipe to valve, 1997-1999 Chevrolet Malibu oil cooler to pipe, and 1995 Ford Taurus tee to water pump. Dayco 88447 is also a useful cross-reference for ACDelco 14202S and Gates 19718 in the same application.

Common Uses

• Replacing a worn heater hose in small-diameter coolant circuits
• Restoring coolant flow between a heater source and tee connection
• Repairing leaks at reservoir filler tee or pipe-to-valve hose runs
• Addressing cracked or softened EPDM hose sections in HVAC plumbing
• Servicing oil cooler to pipe coolant routing on select vehicles

Installation Notes and Tips

Verify the required inside diameter before installation and match the hose routing to the original path. Check the end connections for proper seating on tees, pipes, valves, or water pump fittings, and inspect adjacent clamps and hard lines for wear before reassembly. Confirm vehicle-specific fitment by year, make, model, and position before ordering.

Quality Assurance

Dayco manufactures this hose to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for heater hose applications. The 88447 part number is cataloged for direct lookup and interchange comparison across select OE and aftermarket references.