Mazda CX-9 Grand Touring 2009 Manual page 587

1. Disconnect the negative battery cable.
2. Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT [MZI-3.7].)
3. Remove the air cleaner and fresh air duct component. (See INTAKE-AIR SYSTEM
REMOVAL/INSTALLATION [MZI-3.7] .)
4. Remove the engine cover.
5. Remove the dipstick.
6. Remove in the order indicated in the table.
7. Install in the reverse order of removal.
8. Refill the engine coolant. (See ENGINE COOLANT REPLACEMENT [MZI-3.7].)
9. Inspect for engine coolant leakage. (See ENGINE COOLANT LEAKAGE INSPECTION [MZI-3.7].)
2008 Mazda CX-9 Grand Touring
2008 ENGINE Cooling System (MZI-3.7) - Mazda CX-9
When you are sure all the pressure is gone, press down on the cap
using the cloth, turn it, and remove it.