Dayco 87814 HVAC Heater Hose - Heater Inlet or Heater To Thermostat

Dayco Small I.D. Heater Hose 87814

Dayco 87814 is a Small I.D. Heater Hose built for heater circuit service where a 5/8 in. inside diameter is required at both ends. Made from EPDM with a protective sleeve, this black HVAC heater hose is specified to SAE J20R3 Class D-1 and SAE J1684 Type EC standards for heater hose applications.

Compatible with select Acura RDX and Mazda heater hose applications, this hose is a direct-fit option for common heater inlet and heater-to-thermostat routing needs. The Dayco Small I.D. Heater Hose line focuses on OE-style replacement sizing and material selection for coolant transfer in the HVAC system.

Key Features

• Dayco part number 87814
• EPDM construction for heater hose service
• Black finish for a clean OE-style appearance
• 5/8 in. inside diameter at both ends
• Single I.D. hose design
• Protective sleeve included
• Meets SAE J20R3 Class D-1 and SAE J1684 Type EC specifications

Detailed Description

This heater hose is intended for coolant flow between engine and heater system components, where consistent hose sizing and heat-resistant construction matter. The EPDM material is commonly used in automotive coolant routing because it handles heater hose temperatures and exposure conditions found in daily driving. Dayco 87814 is listed for 2013-2015 Acura RDX heater inlet applications, as well as Mazda 3, CX-7, 6, Protege, and Protege5 heater hose locations. For shoppers searching for a 5/8 heater hose for Acura RDX or a Mazda heater inlet hose, this part number provides a focused fitment match.

This part cross-references Gates 19207 for the same application.

What It Is Used For

• Replacing a cracked or hardened heater hose
• Restoring coolant flow to the heater core circuit
• Addressing coolant seepage at a 5/8 in. hose connection
• Replacing a worn heater inlet hose on Acura RDX or Mazda applications
• Servicing heater-to-thermostat hose routing on select Mazda models

Installation Notes and Tips

• Verify the hose routing and end diameters before installation.
• Inspect adjoining heater pipes, clamps, and fittings for corrosion or wear.
• Drain coolant as needed before removing the existing hose.
• Confirm the hose follows the original path without kinks or twist.
• After installation, refill and bleed the cooling system according to vehicle service procedures.

Quality Assurance

Dayco heater hoses are built to meet published SAE heater hose specifications, including SAE J20R3 Class D-1 and SAE J1684 Type EC. The protective sleeve adds an extra layer of abrasion and heat protection in routed HVAC applications.

• Fits 2013-2015 Acura RDX, Heater Inlet
• Fits 2010-2013 Mazda 3, N/A
• Fits 2007-2012 Mazda CX-7, N/A
• Fits 2006-2007 Mazda 6, N/A
• Fits 2001-2003 Mazda Protege, Heater Inlet
• Fits 2002-2003 Mazda Protege5, Heater Inlet
• Fits 1999 Mazda Protege, Heater To Thermostat