Replace a Leaking Heater Hose

You don't have to replace the whole assembly

Save money on your next heater hose repair by replacing just the leaky hose instead of the whole assembly. All you need is a rotary tool and a new hose.

By the DIY experts of The Family Handyman Magazine

Cut out the leaking piece

Leaky, crimped-on heater hoses can be replaced with new, expensive assemblies. But you can replace just the leaky section for a fraction of the price. It's simple and cheap to do with a short matching length of hose and a new worm-drive clamp. (You should reuse the factory spring clamp, but you can't reuse the old crimp ring.) Check with a local auto parts store to locate replacement molded hose sections. Or bring in the leaking section and see if the staff can visually match it to a stock hose for another vehicle.

If you can't find the proper molded hose, slide a reshaping coil over a straight section of hose and bend it to the proper angle for your application. The coil will maintain the angle and prevent the hose from collapsing at the bend.

Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

  • 4-in-1 screwdriver
  • Hacksaw
  • Rags

You'll also need a rotary tool with a cutoff wheel.

Required Materials for this Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here's a list.

  • Heater hose
  • Worm-drive clamp
  • Reshaping coil

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