Heater Hose Replacement

Step by step guide on how to replace automotive engine heater hoses, this article pertains to most vehicles.

Difficulty Scale: 4 of 10

Tools and Supplies Needed

  • Replacement hoses
  • Hose clamp tool
  • Engine coolant
  • Fluid catch basin
  • Socket set
  • Flashlight
  • Pliers
  • Exacto knife or razor blade
  • Protective eyewear and gloves

Begin with the engine cold, in park with the emergency brake set, drain the cooling system.

Step 1 - Locate the heater hoses to be replaced and remove or relocate any obstructions.

Locate Heater Hoses

Step 2 - Some vehicles use a spring loaded hose clamp which can be removed by using a special hose clamp removal tool, a pair of pliers can also be used. A worm screw style of clamp will use a screw driver to remove.

Hose Clamp Removal Tool

Step 3 - Once the tool has been installed, move the hose clamp to gain access to the hose mounting fitting. (Note: Heater hoses are connected to the heater core, this core is fragile so caution should be used when removing the heater hoses to avoid breaking the core and causing a coolant leak.)

Hose Clamp Removed

Step 4 - After the hose clamps have been loosened and relocated down the hose, use an exacto knife or razor blade to gently slice the hose long ways along the fitting.

Exacto Knife

Step 5 - Once the heater hose has been cut, gently lift and twist the hose to release it from the heater core fitting, repeat this process for the remaining hose.

Heater Hose Removed


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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Article first published (Updated 2015-01-09)