Mazda 3 Quiz
HVAC

Heater Core Inspection

In this manual: HVAC
Vehicle general — 15Accessories — 111Body — 339Brakes — 71Drivetrain — 143Electrical — 58Engine — 251HVAC — 72Restraints — 15Steering — 32Suspension — 41
~1min read

1. Inspect the heater core for damage, cracks, and water leakage.

  • If there is any malfunction, replace the heater core.

2. Visually inspect the fins for bending.

  • If there is any bending, use the end of a flathead screwdriver to straighten the fins.

3. Visually inspect the heater hose for deformation.

  • Repair with pliers if there is deformation. If there is any malfunction, replace the heater core.

Test yourself

A quick Mazda 3 quiz: every answer comes with an explanation and a link to the manual page.