Continental 64420 HVAC Heater Hose - Engine To Pipe-2, Valve To Pipe-1 or Valve To Water Pump

Continental Molded HVAC Heater Hose 64420

Continental 64420 is a molded HVAC heater hose built for coolant transfer between the heater core, bypass circuits, the radiator, and other engine cooling components. With a 0.690 in. inside diameter at both ends and a 13.800 in. molded length, it is sized for direct replacement in select Cadillac, Nissan, and GMC applications.

Key Features

• 0.690 in. inside diameter on hose end 1 and end 2
• 13.800 in. molded hose length for routed cooling-system fitment
• Transfers glycol-based coolant through heater and bypass circuits
• Built to SAE 20R3EC Class D1 and Class D2 specifications
• Resistant to electrochemical degradation (ECR) for cooling-system durability
• Continental Molded line construction for OE-style hose routing

Product Details

This Continental heater hose is engineered for coolant flow in HVAC and engine cooling systems, helping maintain proper circulation through the heater core and related passages. The molded shape supports the routing used on applications such as 1998-2004 Cadillac Seville, 1998-1999 Cadillac DeVille, 1998-1999 Cadillac Eldorado, 2004 Nissan Quest, and 2000-2002 GMC Savana 1500, Savana 2500, and Savana 3500. Part number 64420 is also cross-referenced with Dayco 71544 for the same application.

What It Helps Address

• Coolant leakage from a worn or cracked heater hose
• Restricted coolant flow to the heater core
• Improper hose routing after hose deterioration
• Cooling-system service needs on Cadillac Seville, DeVille, and Eldorado models
• Replacement needs on Nissan Quest and GMC Savana heater hose circuits

Installation Notes and Tips

Verify hose routing, end diameters, and molded shape before installation. This hose is listed for Engine To Pipe-2, Valve To Water Pump, and Valve To Pipe-1 positions depending on vehicle application. Some GMC Savana listings note A/C, exclude auxiliary heater, and require cut-to-fit use; confirm the exact vehicle configuration before service. Use the vehicle’s cooling-system service procedure and refill with the correct glycol-based coolant after installation.

Quality Assurance

Continental 64420 is manufactured to SAE 20R3EC Class D1 and Class D2 requirements and includes resistance to electrochemical degradation for added cooling-system compatibility. The Continental Molded product line focuses on shaped hose routing for direct-fit replacement in specified applications.