Gates 23403 Radiator Coolant Hose - Lower

Brand	Gates 23403
Position	Lower
	0
	Yes
Branch Quantity	0
Centerline Length	21.2
Centerline Length	538
Contains Spring	No
End 1 Inside Diameter	1.52
End 1 Inside Diameter	39
End 2 Inside Diameter	1.77
End 2 Inside Diameter	45
Material	EPDM
Modular Hose	No
Molded	Yes
Number of Quick Connect Fittings	0
Product line	Molded Coolant Hose
Fits	Chevrolet and GMC · 56 vehicles

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

EPDM construction. Resists heat and coolant exposure for long service life.

Molded design. Helps route coolant cleanly through complex hose paths.

Cross-references Bosch 16139, Gates 23403 and 22618M for the same application. See all 4.

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Gates 23403 Molded Coolant Hose

Gates 23403 is a molded radiator coolant hose built for lower cooling-system routing on select Chevrolet and GMC trucks and SUVs. It uses EPDM construction and OEM-style molded dimensions to match the original hose path for a direct replacement on listed applications.

Key Features

EPDM rubber construction for coolant-system service
Molded shape for the lower radiator hose route
Centerline length: 21.2 in. (538 mm)
End inside diameters: 1.52 in. (39 mm) and 1.77 in. (45 mm)
No spring, no modular sections, and no quick-connect fittings
Fits listed Chevrolet C2500, C3500, K2500, K3500 and GMC C2500, C3500, K2500, K3500 applications

Product Details

The Gates Molded Coolant Hose line is built around OEM-quality specifications for upper, lower, bypass, heater, and other coolant routing needs. Part number 23403 is a molded lower radiator hose for 1996-2000 Chevrolet C2500, C3500, K2500, and K3500 models, plus 1996-2000 GMC C2500, C3500, K2500, and K3500 models. It also fits 1996-1999 Chevrolet C2500 Suburban, K2500 Suburban, GMC C2500 Suburban, and GMC K2500 Suburban lower hose applications. This part cross-references Bosch 16139 for the same application.

Common Replacement Uses

Cracked or softened lower radiator hose
Coolant leaks at the hose body or formed bends
Incorrect hose routing after a previous repair
Heat-related hose swelling or collapse
Restoring proper coolant flow on listed Chevrolet and GMC vehicles

Installation Notes

Verify the lower hose routing, end diameters, and centerline length against the removed hose before installation. Inspect hose clamps, radiator necks, and engine-side connections for wear or corrosion so the new hose seals correctly. Confirm fitment by year, make, model, and position before service on Chevrolet C2500, GMC K2500, and related applications.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The molded design and EPDM material support accurate fitment and dependable cooling-system replacement service.

This part fits 56 vehicles

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

Year	Make	Model	Liters	Cylinders	Fuel Type	Position	Notes
2000	Chevrolet	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	Chevrolet	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	Chevrolet	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	Chevrolet	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	GMC	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	GMC	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	GMC	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
2000	GMC	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	Chevrolet	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	Chevrolet	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	Chevrolet	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	Chevrolet	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	Chevrolet	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	Chevrolet	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	GMC	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	GMC	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	GMC	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	GMC	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	GMC	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1999	GMC	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	Chevrolet	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	Chevrolet	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	Chevrolet	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	Chevrolet	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	Chevrolet	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	Chevrolet	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	GMC	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	GMC	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	GMC	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	GMC	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	GMC	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1998	GMC	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	Chevrolet	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	Chevrolet	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	Chevrolet	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	Chevrolet	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	Chevrolet	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	Chevrolet	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	GMC	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	GMC	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	GMC	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	GMC	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	GMC	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1997	GMC	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	Chevrolet	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	Chevrolet	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	Chevrolet	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	Chevrolet	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	Chevrolet	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	Chevrolet	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	GMC	C2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	GMC	C2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	GMC	C3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	GMC	K2500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	GMC	K2500 Suburban	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
1996	GMC	K3500	7.4L	V8	GAS	Lower	Preferred Hose; Molded Coolant Hose
No rows match your filter.

Directly replaces or cross-references 4 part numbers

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

Bosch — 16139Gates — 2340322618M15671937