Mazda 6 Quiz
Heater and air conditioner systems

Heater core inspection

In this manual: Heater and air conditioner systems
General information — 42Engine — 23Lubrication system — 10Cooling system — 9Fuel and emission control systems — 161Engine electrical system — 17Clutch — 21Manual transaxle — 10Automatic transaxle — 110Front and rear axles — 20Steering system — 15Braking system — 104Suspension — 34Body — 201Body electrical system — 287Heater and air conditioner systems — 89Technical data — 1Special tools — 1
~1min read

1. Remove the A/C unit. (See A/C UNIT REMOVAL/INSTALLATION.)

2. Remove the heater core from the A/C unit.

3. Inspect for cracks, damage, and coolant leakage.

  • If any problems are found, replace the heater core.

4. Inspect for bent fins.

  • If any are bent, use a flathead screwdriver to straighten them.

5. Verify that the heater core inlet and outlet pipe are not distorted or damaged.

  • Repair with pliers if necessary.

Test yourself

A quick Mazda 6 quiz: every answer comes with an explanation and a link to the manual page.