Thermostat: Service and Repair

THERMOSTAT REMOVAL/INSTALLATION - 3.0L









1. Drain the cooling system. See Removal and Replacement.

2. Disconnect the lower radiator hose from the thermostat housing.

3.

CAUTION:Early build vehicle cooling systems are filled with Mazda Premium Gold Engine Coolant. Late build vehicle cooling systems are filled with Mazda Specialty Orange Engine Coolant. Do not mix coolant types. Mixing coolant types degrades the corrosion protection of the coolant. Failure to follow these instructions may damage the engine or cooling system.
NOTE:To install, lubricate the thermostat housing O-ring seal with clean engine coolant. Use the same type of coolant that was drained from the system.
Remove the 2 bolts, thermostat housing cover, O-ring seal and thermostat.

- To install, tighten to 10 Nm {1.0 kgf-m, 89 in-lbf}.

4. To install, reverse the removal procedure.

- Clean and inspect the O-ring seal. Install a new seal if necessary.

NOTE:To install, lubricate the thermostat housing O-ring seal with clean engine coolant.
5. Fill and bleed the cooling system. See Removal and Replacement.