The radiator bottom hose (also called the lower radiator hose) carries coolant from the radiator back to the engine. It is a key part of the cooling system, keeping engine temperatures stable. Over time, the hose can become cracked, swollen, or leak due to constant heat and pressure. Replacing a worn bottom hose prevents coolant leaks, overheating, and engine damage.

What is a radiator bottom hose replacement?

This service involves removing the old, worn, or leaking lower radiator hose and installing a new one. The cooling system is then refilled with coolant and bled to remove air pockets, ensuring smooth operation.

Why do you need a radiator bottom hose replacement?

A faulty or leaking radiator hose can cause coolant loss, overheating, and potential engine failure. Replacing it ensures proper coolant flow between the radiator and engine, protecting the engine from overheating.

Common signs you need a radiator bottom hose replacement

• Visible coolant leak under the vehicle
• Coolant warning light on the dashboard
• Engine overheating or running hotter than normal
• Swollen, cracked, or soft radiator hose
• Low coolant levels despite regular top-ups

What happens during a radiator bottom hose replacement?

A mechanic will:

1. Inspect the radiator hoses and cooling system
2. Drain the coolant from the radiator
3. Remove the worn or damaged bottom hose
4. Install a new manufacturer-approved hose with clamps
5. Refill the cooling system with fresh coolant
6. Bleed the system to remove air pockets
7. Test the engine to confirm proper cooling

How much does a radiator bottom hose replacement cost?

Replacement typically costs $180–$350, depending on the vehicle. Costs may be higher if additional cooling components or coolant need replacing.

Is it unsafe to drive with a damaged radiator bottom hose?

Yes. A leaking or broken hose can cause rapid coolant loss and severe engine overheating, leading to major engine damage. The vehicle should not be driven until the hose is replaced.