Dayco 70553 Engine Coolant Bypass Hose

Dayco Curved Radiator Hose for Jeep Cooling Systems

Dayco 70553 is an engine coolant bypass hose built for Jeep cooling system service where a curved, dual I.D. hose is required. Made from EPDM rubber and finished in black, it is specified for applications that need a 3/4 in. end on one side and a 7/8 in. end on the other.

This Dayco Curved Radiator Hose line is focused on replacement cooling hoses with OE-style routing and fitment detail. For Jeep Grand Wagoneer, Jeep J10, Jeep J20, Jeep Cherokee, Jeep Wagoneer, Jeep CJ5, and Jeep CJ7 applications, Dayco 70553 provides a direct-match service part for the listed vehicles.

Key Features

• Part number: 70553
• Engine coolant bypass hose / curved radiator hose application
• EPDM construction for cooling-system use
• Dual I.D. hose with 3/4 in. and 7/8 in. inside diameters
• Black finish
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• No heat shield and no protective sleeve

Detailed Description

Dayco 70553 is a curved radiator hose designed for coolant bypass service in Jeep cooling systems. The dual inside diameter design helps match the hose ends to the specified connections, while the EPDM material is suited for engine coolant exposure and underhood temperature cycling. This hose is listed for a wide range of classic Jeep applications, including Grand Wagoneer, J10, J20, Cherokee, Wagoneer, CJ5, and CJ7 models. If you are searching for a Jeep coolant bypass hose or a Dayco 70553 replacement hose for older Jeep cooling repairs, this part number is the direct reference to use.

This part cross-references Gates 20625 for the same application.

What It Is Used For

• Replacing a cracked or softened coolant bypass hose
• Restoring proper coolant routing in Jeep cooling systems
• Addressing leaks at mismatched or worn hose ends
• Correcting hose fitment on curved radiator hose runs
• Servicing older Jeep engines that use dual I.D. hose connections

Installation Notes and Tips

• Verify the hose end sizes before installation: 3/4 in. on one end and 7/8 in. on the other.
• Confirm vehicle application against the listed Jeep fitment before ordering.
• Inspect clamps, necks, and adjoining coolant pipes for corrosion or wear during replacement.
• Check hose routing for clearance and avoid twisting the hose during installation.
• For 1974 Jeep CJ5 applications, the listing notes vehicles without air conditioning.

Quality Assurance

Dayco 70553 is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent hose construction for cooling-system service. The Dayco Curved Radiator Hose line is built for replacement applications where accurate dimensions and material selection matter.

Compatible With Jeep Models

• Fits 1984-1991 Jeep Grand Wagoneer, N/A
• Fits 1974-1988 Jeep J10, N/A
• Fits 1974-1988 Jeep J20, N/A
• Fits 1974-1983 Jeep Cherokee, N/A
• Fits 1972-1983 Jeep Wagoneer, N/A
• Fits 1975-1981 Jeep CJ5, N/A
• Fits 1972-1973 Jeep CJ5, N/A
• Fits 1976-1981 Jeep CJ7, N/A
• Fits 1974 Jeep CJ5, N/A; fits vehicles without air conditioning