Continental 66683 Engine Coolant Bypass Hose

Continental 66683 Engine Coolant Bypass Hose

Continental 66683 is a molded engine coolant bypass hose built for vehicles that need a precise coolant transfer path in the cooling system. The EPDM tube and cover, along with synthetic reinforcement, meet or exceed SAE 20R4EC Class D1 requirements for this application.

As part of Continental’s Molded line, this hose follows an exact OEM configuration for a direct-fit replacement on select Nissan and INFINITI applications, including Frontier, Xterra, Pathfinder, and QX4 models.

Key Features

• Engine coolant bypass hose for glycol-based coolant circulation
• EPDM tube and cover for cooling-system service
• Synthetic reinforcement meets or exceeds SAE 20R4EC Class D1 specifications
• Exact OEM configuration for fitment accuracy
• Continental Molded line replacement part number 66683

Detailed Description

Continental 66683 is engineered as an engine coolant bypass hose for select Nissan Frontier, Nissan Xterra, Nissan Pathfinder, and INFINITI QX4 applications. The molded construction follows the original hose shape and dimensions, helping maintain the factory routing used in the vehicle’s cooling system. Hose 1 inside diameter measures 1.060 inches, hose 1 length measures 4.760 inches, and the end 2 hose inside diameter is 1.060 inches.

This part cross-references Dayco 70982 and Gates 22518 for the same application. If you are replacing a worn coolant bypass hose on a 1996-2004 Nissan Pathfinder or a 1999-2004 Nissan Frontier, Continental 66683 provides the OE-style molded configuration needed for a proper service replacement.

Common Problems This Hose Can Address

• Coolant leakage from a cracked or aged bypass hose
• Restricted coolant flow through the bypass circuit
• Softening, swelling, or deterioration of the original EPDM hose
• Fitment issues caused by an incorrect straight hose replacement
• Cooling-system service on select Nissan and INFINITI vehicles

Installation Notes and Tips

Verify hose routing and dimensions against the original part before installation. Because this is a molded coolant bypass hose, correct orientation matters for proper fit on the vehicle’s cooling system. Confirm application details for your specific Frontier, Xterra, Pathfinder, or QX4 before service, and inspect adjoining clamps, pipes, and coolant passages for wear or contamination.

Quality Assurance

Continental’s Molded hose line uses materials and construction that meet or exceed SAE 20R4EC Class D1 specifications for this coolant hose application. The OEM-style molded configuration supports accurate replacement on the listed Nissan and INFINITI fitments, including 1996-2004 Nissan Pathfinder, 1997-2000 INFINITI QX4, 1999-2004 Nissan Frontier, and 2000-2004 Nissan Xterra.