What is the primary function of this lower coolant hose?

The lower coolant hose connects your vehicle's radiator to the engine block. Its main job is to allow coolant to flow from the radiator back into the engine, helping to regulate engine temperature and prevent overheating.

Why is a molded hose sometimes better than a universal hose?

Molded hoses are shaped to match the original factory routing of your vehicle's specific application. This means a more precise fit, less stress on the hose material, and often an easier installation compared to universal hoses that might need to be cut or bent into place.

When should I consider replacing my coolant hoses?

Coolant hoses should be inspected regularly for cracks, swelling, or softness. It's a good practice to replace them preventatively every 5-7 years, or whenever you're performing other cooling system maintenance like replacing the radiator or water pump.

Gates 80-84 Chevrolet C & K Series Pickup 6-Cyl. 4.1L Lower Molded Coolant Hose

Specifications

Brand: Gates
Part #: 21059
UPC: 00072053054750

Gates 80-84 Chevrolet C & K Series Pickup 6-Cyl. 4.1L Lower Molded Coolant Hose

Name: Gates 80-84 Chevrolet C & K Series Pickup 6-Cyl. 4.1L Lower Molded Coolant Hose
Brand: Gates
Price: 67.06 USD
Availability: InStock

$67.06

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Key Features

Fits 1977-1986 Chevrolet and GMC C/K Series trucks, Suburbans, Blazers, Jimmys, and more.
Designed for 6-cylinder, 4.1L engines.
Molded shape follows the original factory routing for a direct fit.
Constructed from heat-resistant rubber to withstand engine temperatures.
Replaces the lower radiator hose, a critical component for coolant circulation.

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Will this fit your vehicle?

Product Details

This is the Gates 21059 lower molded coolant hose, specifically made for 6-cylinder, 4.1L engines in Chevrolet and GMC trucks from the late 70s through the mid-80s. If you're working on a classic C/K series pickup, Suburban, or even a Blazer or Jimmy from those years, this hose is designed to connect your radiator to the engine block, letting coolant circulate to keep things from overheating.

Gates makes these hoses with strong, heat-resistant rubber that can handle the constant expansion and contraction from engine temperature changes. The molded shape means it follows the factory routing precisely, so you don't have to fight with a hose that's too stiff or doesn't quite reach. This particular hose is for the lower radiator connection, which is a common spot for hoses to crack or get mushy over time due to heat and age.

Replacing your coolant hoses is a smart move when you're doing other cooling system work, like a radiator or water pump replacement. It's a good idea to check the condition of all your hoses while you're in there, as a failed hose can leave you stranded.