Heater Hoses and Heater Hose Sizes for Cars and Trucks

Heater hoses carry hot coolant from the engine to the heater core, simple straight sections rather than the complex molded shape of a radiator hose. CBT Auto Parts stocks heater hoses and heater hose by the foot, for cars, trucks, and classics.

Every heater hose here is OEM grade, vehicle-specific, or sold by diameter for a custom fit, so you can match factory routing exactly. Confirm fitment by year, make, and model, or by diameter, then add a heater core or water pump from the wider Cooling, HVAC and Climate Control Parts range. Orders ship fast worldwide, with support on hand if you're unsure which size fits.

Heater Hoses

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FAQs

1. How do I know what diameter heater hose I need?

Measure the outside diameter of your existing hose or the fitting it connects to directly; common sizes include 5/8, 3/4, and 1.25 inches.

2. Is a heater hose the same as a radiator hose?

No, heater hoses carry a smaller coolant volume just for the heater core, while radiator hoses carry the full cooling system flow.

3. Why do some vehicles use metric heater hose sizes like 19mm?

Imported and European vehicles often spec metric diameters, which don't map cleanly onto common imperial sizes like 5/8 or 3/4 inch.

4. Can I buy a heater hose by the foot instead of a pre-shaped piece?

Yes, bulk diameter hose works well for custom builds or restorations where the original routing doesn't exist anymore.

5. Why would an older engine like a Ford 302 need a specific heater hose fitting?

Fitting sizes sometimes changed across production years, even within the same engine family, so checking directly is more reliable than assuming.