Continental 66303 Radiator Coolant Hose - Upper - Connector To Radiator, Upper - Filler Neck To Engine or Upper - Radiator To Filler Neck

Radiator Coolant Hose Overview

This Continental Molded radiator coolant hose is built for Nissan cooling system service where an exact OEM configuration matters. It transfers glycol-based coolant through the system and uses EPDM construction with synthetic reinforcement for dependable routing and fit.

Part number 66303 is a molded replacement for select Nissan Altima, Nissan Quest, Nissan Murano, and Nissan Maxima applications. The molded shape follows the original hose path for upper cooling-system connections.

Key Features

• EPDM tube and cover for coolant-system use
• Synthetic reinforcement meets or exceeds SAE 20R4EC Class D1 specifications
• Exact OEM configuration for accurate fitment
• Molded design for proper hose routing
• Built for glycol-based coolant transfer

Detailed Description

Continental part number 66303 is a molded radiator coolant hose engineered for upper cooling-system routing on select Nissan vehicles. Its EPDM tube and cover, along with synthetic reinforcement, are specified to meet or exceed SAE 20R4EC Class D1 requirements. The molded profile supports the original hose path, while the OEM-style configuration helps maintain correct connection geometry during replacement service.

Compatible fitment includes Fits 2007-2018 Nissan Altima, Upper - Radiator To Filler Neck; Fits 2007-2011 Nissan Altima, Upper - Filler Neck To Engine; Fits 2011-2017 Nissan Quest, Upper - Radiator To Filler Neck; Fits 2009-2014 Nissan Murano, Upper - Connector To Radiator; and Fits 2009-2013 Nissan Maxima, Upper - Radiator To Filler Neck. This part cross-references Dayco 71638 for the same application.

For Nissan Altima, Nissan Murano, and Nissan Maxima cooling-system repairs, 66303 provides a direct molded hose replacement that follows the original routing and connection points.

What It Is Used For

• Replacing a cracked or softened radiator coolant hose
• Restoring coolant flow through the upper cooling circuit
• Correcting hose routing after a failed molded hose
• Addressing leaks at radiator-to-filler-neck or connector connections
• Servicing cooling-system hoses on Nissan Altima, Quest, Murano, and Maxima models

Installation Notes and Tips

Verify hose routing, connection style, and measured dimensions before installation. This hose has a 1.310-inch inside diameter at both ends and a 5.120-inch length. Confirm the vehicle’s original molded path matches the listed upper-position application before replacing the part.

Quality Assurance

Continental Molded hoses are built to meet application-specific cooling-system requirements, and this hose is manufactured to SAE 20R4EC Class D1 standards or better. The exact OEM configuration supports accurate replacement service on the listed Nissan applications.