Gates 20843 Radiator Coolant Hose - Lower, Lower - Engine To Radiator or Upper

Gates 20843 Molded Coolant Hose

The Gates 20843 molded coolant hose is built for lower radiator hose applications that require an OEM-style formed shape and precise fit. Made from EPDM, it supports dependable coolant routing on classic Chevrolet and GMC trucks, vans, and motorhome chassis applications.

Key Features

• EPDM construction for coolant-system service
• Molded design for a formed, application-specific fit
• 1.5 in. end 1 inside diameter and 1.75 in. end 2 inside diameter
• 21.8 in. centerline length
• No spring and no quick-connect fittings
• Lower radiator hose application for selected Chevrolet and GMC vehicles

Product Details

Gates Molded Coolant Hose line is engineered for upper, lower, bypass, heater, and other coolant routing needs with OEM-quality specifications. Part number 20843 is a molded lower radiator coolant hose that follows the original hose path for the listed Chevrolet P30, P20, C10, C20, K10, K20, K30, Blazer, and GMC P3500, P2500, C1500, C2500, C3500, K1500, K2500, K3500, and Jimmy applications. This part cross-references Dayco 70735 for the same application.

Common Problems This Hose Addresses

• Cracked or leaking lower radiator hose
• Collapsed or softened hose from age and heat exposure
• Poor coolant flow caused by a damaged hose route
• Fitment issues from using a universal hose instead of a molded replacement
• Cooling-system service on Chevrolet P30 and GMC P3500 lower hose applications

Installation Notes and Tips

Verify end diameters, centerline length, and vehicle application before installation. Inspect hose clamps, radiator necks, and water pump connections for corrosion or wear, and replace any damaged sealing surfaces before filling the cooling system. Confirm lower-position routing on the specific Chevrolet or GMC model listed for your application.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for direct replacement use in the listed applications. The EPDM construction and formed profile support consistent fitment across the specified Chevrolet and GMC lower radiator hose applications.