Gates 20842 Radiator Coolant Hose - Lower

Gates 20842 Molded Lower Coolant Hose

The Gates 20842 molded coolant hose is built for lower radiator hose service on a wide range of Chevrolet and GMC trucks, vans, and Suburban models. It uses EPDM construction and OEM-style molded shaping to match the routing needed for proper coolant flow and a clean underhood fit.

Gates Molded Coolant Hose products are engineered for radiator, heater, bypass, and other coolant-system applications. This line is built to OE-style specifications so you can replace a worn lower hose without relying on dealer-only sourcing for common cooling-system repairs.

• EPDM rubber construction for coolant-system durability
• Molded design for accurate routing and fit
• Lower radiator hose application
• End 1 inside diameter: 1.5 in. (38 mm)
• End 2 inside diameter: 1.75 in. (44 mm)
• Centerline length: 20.7 in. (526 mm)
• No spring and no quick-connect fittings

Fitment and application details

Compatible with lower hose applications on classic Chevrolet C10, C20, C30, K10, K20, K30, P20, P30, G10, G20, G30, and Suburban models, plus GMC C1500, C2500, C3500, G1500, G2500, G3500, K1500, K3500, P1500, and P3500 models listed in the fitment data. Fits 1988-1993 Chevrolet G30, Lower; Fits 1983-1984 Chevrolet G30, Lower; Fits 1988-1993 GMC G3500, Lower; Fits 1983-1984 GMC G3500, Lower; Fits 1989-1991 Chevrolet R2500 Suburban, Lower; Fits 1989-1991 Chevrolet R3500, Lower; Fits 1989-1991 Chevrolet V3500, Lower; Fits 1987-1991 GMC R2500 Suburban, Lower; Fits 1987-1991 GMC R3500, Lower; Fits 1987-1991 GMC V3500, Lower; Fits 1990 Chevrolet V2500 Suburban, Lower; Fits 1989 Chevrolet R2500, Lower; Fits 1987-1989 GMC R2500, Lower; Fits 1987-1988 Chevrolet R20, Lower; Fits 1987-1988 Chevrolet R20 Suburban, Lower; Fits 1987-1988 Chevrolet R30, Lower; Fits 1987-1988 Chevrolet V20 Suburban, Lower; Fits 1987-1988 Chevrolet V30, Lower; Fits 1978-1986 Chevrolet C20, Lower; Fits 1975 Chevrolet C20, Lower; Fits 1979-1986 Chevrolet C20 Suburban, Lower; Fits 1973-1975 Chevrolet C20 Suburban, Lower; Fits 1978-1986 Chevrolet C30, Lower; Fits 1975 Chevrolet C30, Lower; Fits 1980-1986 Chevrolet K30, Lower; Fits 1979-1986 GMC C2500, Lower; Fits 1979-1986 GMC C2500 Suburban, Lower; Fits 1979-1986 GMC C3500, Lower; Fits 1979-1986 GMC K3500, Lower; Fits 1985 Chevrolet K20 Suburban, Lower; Fits 1973-1974 Chevrolet K20 Suburban, Lower; Fits 1983-1984 Chevrolet G10, Lower; Fits 1983-1984 Chevrolet G20, Lower; Fits 1983-1984 GMC G1500, Lower; Fits 1983-1984 GMC G2500, Lower; Fits 1978-1980 Chevrolet C10, Lower; Fits 1975 Chevrolet C10, Lower; Fits 1979-1980 Chevrolet C10 Suburban, Lower; Fits 1973-1975 Chevrolet C10 Suburban, Lower; Fits 1980 Chevrolet K10, Lower; Fits 1978-1980 Chevrolet P30, Lower; Fits 1979-1980 GMC C1500, Lower; Fits 1979-1980 GMC C1500 Suburban, Lower; Fits 1980 GMC K1500, Lower; Fits 1979-1980 GMC P3500, Lower; Fits 1979 Chevrolet P20, Lower; Fits 1979 GMC P1500, Lower; Fits 1978 Chevrolet K20, Lower; Fits 1976-1977 Chevrolet C10, Lower; Fits 1976-1977 Chevrolet C10 Suburban, Lower; Fits 1976-1977 Chevrolet C20, Lower; Fits 1976-1977 Chevrolet C20 Suburban, Lower; Fits 1976-1977 Chevrolet C30, Lower; Fits 1976-1977 Chevrolet K20, Lower; Fits 1977 Chevrolet K30, Lower; Fits 1976-1977 Chevrolet P30, Lower; Fits 1976 Chevrolet K10, Lower; Fits 1976 Chevrolet P20, Lower; Fits 1975 Chevrolet P30, Lower; Fits 1973-1974 Chevrolet K10 Suburban, Lower.

This part cross-references Dayco 70752 and Continental 61176 for the same application.

Common cooling-system repairs

• Lower radiator hose cracking or softening
• Coolant seepage at the hose ends
• Collapsed hose shape from age and heat cycling
• Poor hose routing after a previous replacement
• Cooling-system service on Chevrolet and GMC truck platforms

Installation notes and tips

Inspect the radiator neck, water pump outlet, and clamps before installation. Confirm the hose routing matches the original lower hose path and verify the inside diameters and centerline length against the removed part before final assembly. On vehicles with tight engine-bay packaging, proper molded shape is important for clearance and consistent coolant flow.

Quality assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The Gates molded coolant hose line is built as a broad replacement range for radiator and heater hose service across common domestic truck and van platforms.