Dayco 88416 HVAC Heater Hose - Heater Inlet or Left

Dayco Small I.D. Heater Hose 88416

Dayco 88416 is a Small I.D. Heater Hose built for HVAC heater inlet applications that require a 3/4 in. inside diameter at both ends. Made from EPDM with a black finish and a protective sleeve, it is engineered for dependable coolant transfer in select Buick, Pontiac, and GM applications.

This Dayco Small I.D. Heater Hose line focuses on direct-fit heater hose routing for vehicles that need a compact-diameter hose with OE-style construction. Part number 88416 is a practical replacement choice for heater inlet service on Buick LeSabre, Buick Park Avenue, Pontiac Bonneville, and Buick Lucerne applications.

Key Features

• EPDM construction for heater hose service
• 3/4 in. inside diameter at both ends
• Single I.D. hose design for HVAC heater inlet routing
• Black exterior finish
• Protective sleeve included
• Built to SAE J20R3 Class D-1 and SAE J1684 Type EC specifications
• Compatible with select Buick, Pontiac, and General Motors applications

Product Details

Dayco 88416 is a Small I.D. Heater Hose designed for coolant circulation through the heater circuit. The EPDM hose material is commonly used in automotive cooling and HVAC systems because it handles heater hose duty with the flexibility needed for routing around engine bay components. Its 3/4 in. end diameters and single I.D. construction make it suitable for applications that call for a consistent hose size from end to end.

Fits 2006-2008 Buick Lucerne, Left. Fits 2000-2005 Buick LeSabre, Heater Inlet. Fits 2000-2005 Buick Park Avenue, Heater Inlet. Fits 2000-2005 Pontiac Bonneville, Heater Inlet. This part cross-references ACDelco 18188L and Gates 19759 for the same application.

Common Replacement Uses

• Replacing a cracked or hardened heater inlet hose
• Restoring coolant flow to the heater core circuit
• Addressing coolant seepage at a worn hose section
• Replacing a hose with incorrect inside diameter
• Servicing HVAC heater hose routing on select GM vehicles

Installation Notes and Tips

Verify the hose routing, end diameter, and position before installation. Confirm the application location as Heater Inlet or Left, depending on the vehicle, and inspect adjoining clamps, fittings, and heater pipe connections for wear or corrosion. Match the hose to the vehicle’s original routing to maintain proper clearance around hot and moving components.

Quality Assurance

Dayco 88416 is manufactured to SAE J20R3 Class D-1 and SAE J1684 Type EC requirements, supporting consistent heater hose performance in automotive HVAC service. The included protective sleeve adds an extra layer of abrasion protection in routed areas where contact resistance matters.