Dayco 70840 Radiator Coolant Hose - Filler Tank, Lower - Pipe To Engine or Upper

Dayco Curved Radiator Hose 70840

Dayco 70840 is a curved radiator coolant hose built for specific import and compact vehicle applications that require a 1 1/16-inch inside diameter at both ends. Made from EPDM and finished in black, this single I.D. hose is specified for upper and lower cooling-system routing where a formed hose shape is needed for proper alignment.

Key Features

• EPDM construction for coolant-system service
• Black curved radiator hose profile for routed cooling connections
• 1 1/16-inch inside diameter at both ends
• Single I.D. hose design
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield or protective sleeve included

Product Details

The Dayco Curved Radiator Hose line is built for applications that need a formed hose shape rather than a straight universal hose. Part number 70840 is used in cooling-system layouts where the hose must follow a curved path between the radiator, pipe, or engine connection while maintaining consistent coolant flow. This hose is a direct-fit style option for vehicles such as the Suzuki Swift, Suzuki Samurai, Dodge Colt, Chevrolet Sprint, Mitsubishi Mirage, Pontiac Firefly, Suzuki Forsa, and Subaru Standard in the listed positions.

This part cross-references Gates (e.g., 20944, 21621) for the same application.

Vehicle Fitment

• Fits 1995-1997 Suzuki Swift, Upper, Curved Radiator Hose
• Fits 1986-1995 Suzuki Samurai, Lower - Pipe To Engine, Curved Radiator Hose
• Fits 1991 Dodge Colt, Upper, Curved Radiator Hose
• Fits 1985-1988 Dodge Colt, Upper, Curved Radiator Hose
• Fits 1985-1988 Chevrolet Sprint, Upper, Curved Radiator Hose
• Fits 1985-1988 Mitsubishi Mirage, Upper, Curved Radiator Hose
• Fits 1985-1988 Pontiac Firefly, Upper, Curved Radiator Hose
• Fits 1985-1988 Suzuki Forsa, Upper, Curved Radiator Hose
• Fits 1976 Subaru Standard, Upper, Exc. Calif.; Curved Radiator Hose
• Fits 1976 Subaru Standard, Upper, w/o Calif.; Curved Radiator Hose

Common Cooling Issues Addressed

• Cracked or split radiator hose material
• Coolant seepage at a formed hose section
• Incorrect hose routing on upper or lower cooling connections
• Softening or swelling from age and heat exposure
• Loss of proper hose shape in a curved application

Installation Notes

Verify end diameters, routing, and position before installation. Dayco 70840 is a curved hose with a 1 1/16-inch inside diameter at both ends, so it should be matched to the listed upper or lower pipe-to-engine applications only. Inspect adjoining clamps, necks, and pipes for corrosion or damage before installing the new hose, and confirm the hose follows the original routing without twist or kinks.

Quality Assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements, supporting consistent material and dimensional standards for cooling-system service.