Dayco 70040 Radiator Coolant Hose - Lower - Connector To Engine or Lower - Main Radiator

Dayco 70040 Curved Radiator Hose

The Dayco 70040 curved radiator hose is a direct-fit coolant hose for select Ram heavy-duty trucks. It is built for lower radiator hose routing on 2013-2018 Ram 2500 and Ram 3500 applications, including lower main radiator and lower connector-to-engine positions.

Key Features

• Brand: Dayco Curved Radiator Hose
• Part number: 70040
• Part type: radiator coolant hose
• Fits lower radiator hose locations on select Ram 2500 and Ram 3500 trucks
• Application-specific curved shape for the listed cooling system routing

Fitment Details

• Fits 2016-2018 Ram 2500, lower - connector to engine.
• Fits 2016-2018 Ram 3500, lower - connector to engine.
• Fits 2013-2015 Ram 2500, lower - main radiator.
• Fits 2013-2015 Ram 3500, lower - main radiator.

Dayco 70040 is a curved radiator hose made for the lower coolant circuit on Ram 2500 and Ram 3500 diesel and gas cooling-system layouts covered by the fitment data. The formed hose profile helps match the factory routing between the radiator and engine-side connection points, making it a practical replacement when the original hose is cracked, swollen, leaking, or no longer holding proper coolant pressure. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Repair Issues

• Coolant seepage at the lower hose connection
• Cracking or hardening from heat cycling
• Swelling, soft spots, or hose collapse
• Loss of coolant from a damaged radiator hose
• Incorrect hose routing after a previous repair

Installation Notes

Verify the vehicle year, Ram 2500 or Ram 3500 model, and lower hose position before installation. Inspect hose clamps, radiator necks, and engine fittings for wear or corrosion, and replace any damaged sealing surfaces before filling and bleeding the cooling system.

Quality Assurance

Dayco is a recognized supplier of cooling-system components, and this hose is cataloged for the specific Ram applications listed above. Confirm fitment against the vehicle’s cooling layout before purchase.