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A heater hose transports hot coolant from the engine to the heater core and returns it to the engine. This process enables the heating system to provide warm air to the vehicle's cabin.

Common signs of failure include: Coolant leaks under the vehicle. Overheating engine. Reduced or no warm air from the heater. Visible cracks, bulges, or brittleness on the hose.

Heater hoses typically last 50,000 to 100,000 miles or 5–10 years. However, regular inspection is recommended, as their lifespan depends on usage, environment, and coolant condition.

Driving with a leaking heater hose is not recommended. It can lead to coolant loss, engine overheating, or damage to other components.

Age-related wear and tear. Exposure to high heat and pressure. Poor-quality or contaminated coolant. Physical damage or abrasion.

Regularly inspect for visible damage or leaks. Ensure hose clamps are secure and in good condition. Use the manufacturer-recommended coolant and flush the cooling system periodically.

If you have mechanical experience, replacing a heater hose is manageable with the right tools. Ensure the engine is cool, drain the coolant, and use proper clamps and hoses.

Leaks may result from: Cracks or holes due to aging. Loose or damaged clamps. Excessive system pressure.