Intake Manifold Removal Note

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Drain the engine coolant. (See ENGINE COOLANT REPLACEMENT [MZI-3.7] ).
Disconnect the upper radiator hose.

Fig 1: Identifying Intake Manifold Hoses
Courtesy of MAZDA MOTORS CORP.
Disconnect the lower radiator hose.
Disconnect the two water hose from the thermostat component.
Disconnect the thermostat component side of the water inlet pipe which is under the intake manifold.
Remove the intake manifold and thermostat component as a single unit.
Remove the thermostat component from the intake manifold.

Fig 2: Thermostat Components With Torque Specifications

Courtesy of MAZDA MOTORS CORP.