Gates 21718 Radiator Coolant Hose - Lower

Brand	Gates 21718
Position	Lower
	0
	Yes
Branch Quantity	0
Centerline Length	28.1
Centerline Length	714
Contains Spring	No
End 1 Inside Diameter	1.5
End 1 Inside Diameter	38
End 2 Inside Diameter	1.73
End 2 Inside Diameter	44
Material	EPDM, Plastic
Modular Hose	No
Molded	Yes
Number of Quick Connect Fittings	0
Product line	Molded Coolant Hose
Fits	Chevrolet and GMC · 72 vehicles

OEM-quality specifications. Built as a molded coolant hose for dependable radiator hose replacement.

Molded construction. EPDM and plastic materials help deliver a precise, formed fit.

Part of Gates' molded coolant hose line for broad coolant application coverage.

Cross-references AP Exhaust 8408, AP Exhaust 642311 and Continental 61455 for the same application. See all 25.

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Not what you need? See all Radiator Coolant Hose options

Gates 21718 Molded Coolant Hose

Gates 21718 is a molded radiator coolant hose built to OEM-quality specifications for lower cooling-system applications. It is formed from EPDM and plastic for the correct shape and fit, helping restore proper coolant routing on supported Chevrolet and GMC trucks and vans.

Key Features

Molded coolant hose for lower radiator and heater hose routing
EPDM and plastic construction for cooling-system service
Centerline length: 28.1 in. (714 mm)
End inside diameters: 1.5 in. (38 mm) and 1.73 in. (44 mm)
No spring and no quick-connect fittings
Direct replacement style for selected Chevrolet and GMC applications

Product Details

This Gates Molded Coolant Hose line is engineered for upper, lower, bypass, heater, and other coolant applications with OE-style dimensions and formed routing. Part number 21718 is shaped for the lower position and is listed for 1988-1993 Chevrolet K1500 and K2500, 1988-1990 Chevrolet C1500 and C2500, 1991-1992 Chevrolet C1500 and C2500, 1992-1995 Chevrolet G10, G20, and G30, plus matching GMC G1500, G2500, G3500, C1500, C2500, K1500, and K2500 applications. If you are replacing a lower radiator coolant hose on a Chevrolet C1500 or GMC K2500, Gates 21718 provides the molded profile needed for proper routing. This part cross-references Dayco 71421 and Continental 61455 for the same application.

What It Helps Address

Coolant leaks from a cracked or aged lower hose
Improper hose routing after a previous repair
Heat-related hose softening or collapse
Loss of coolant flow through the radiator circuit
Fitment issues on lower hose replacement jobs for Chevrolet and GMC trucks and vans

Installation Notes

Verify the vehicle year, make, model, and lower hose routing before installation. Compare the hose shape, end diameters, and centerline length to the original part to confirm correct alignment on the radiator and engine connections. Inspect adjoining clamps, necks, and coolant passages for wear or corrosion before installing the new hose.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The molded design supports accurate replacement of the original lower hose on compatible Chevrolet and GMC vehicles.

This part fits 72 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Drive Type	Liters	Cylinders	Fuel Type	Position	Notes
1995	Chevrolet	G10	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1995	Chevrolet	G20	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1995	Chevrolet	G30	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1995	GMC	G1500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1995	GMC	G2500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1995	GMC	G3500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1994	Chevrolet	G10	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1994	Chevrolet	G20	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1994	Chevrolet	G30	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1994	GMC	G1500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1994	GMC	G2500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1994	GMC	G3500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	Chevrolet	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	Chevrolet	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	Chevrolet	G10	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	Chevrolet	G20	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	Chevrolet	G30	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	Chevrolet	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	Chevrolet	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	GMC	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	GMC	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	GMC	G1500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	GMC	G2500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	GMC	G3500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1993	GMC	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1993	GMC	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1992	Chevrolet	C1500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1992	Chevrolet	C2500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1992	Chevrolet	G10	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1992	Chevrolet	G20	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1992	Chevrolet	G30	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1992	Chevrolet	K1500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1992	Chevrolet	K2500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1992	GMC	C1500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1992	GMC	C2500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1992	GMC	G1500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1992	GMC	G2500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1992	GMC	G3500	—	4.3L	V6	GAS	Lower	HVAC heater hose with A/C, fits Serpentine Belt application.; Molded Coolant Hose
1992	GMC	K1500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1992	GMC	K2500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1991	Chevrolet	C1500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1991	Chevrolet	C2500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1991	Chevrolet	K1500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1991	Chevrolet	K2500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1991	GMC	C1500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1991	GMC	C2500	—	4.3L	V6	GAS	Lower	Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose
1991	GMC	K1500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1991	GMC	K2500	4WD	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	Chevrolet	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	Chevrolet	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	Chevrolet	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	Chevrolet	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	GMC	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	GMC	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	GMC	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1990	GMC	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	Chevrolet	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	Chevrolet	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	Chevrolet	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	Chevrolet	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	GMC	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	GMC	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	GMC	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1989	GMC	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	Chevrolet	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	Chevrolet	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	Chevrolet	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	Chevrolet	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	GMC	C1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	GMC	C2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	GMC	K1500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
1988	GMC	K2500	—	4.3L	V6	GAS	Lower	Molded Coolant Hose
No rows match your filter.

Directly replaces or cross-references 25 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

AP Exhaust — 8408AP Exhaust — 642311Continental — 61455Dayco — 71421Gates — 21718MOOG Driveline Products — 377Walker Exhaust — 4145514-2563-6216926157X15548679155657311556783515592592156072321565515315659491156596171567175915671904C1718E71421KM-2283MC201MH-4718