Thermostat: Service and Repair

Thermostat - 3.0L (4V)













Removal and Installation

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Vehicle Jacking and Lifting.

2. Drain the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding Service and Repair.

3. Disconnect the positive battery cable. For additional information, refer to Battery.

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

5. NOTICE: Early build vehicle (built before July 6, 2009) cooling systems are filled with Motorcraft(R) Premium Gold Engine Coolant. Late build vehicle (built on or after July 6, 2009) cooling systems are filled with Motorcraft(R) Specialty Green Engine Coolant. Mixing coolant types degrades the corrosion protection of the coolant. Do not mix coolant types. Failure to follow these instructions may result in engine or cooling system damage.

NOTICE: Genuine Mazda(R) Extended Life Coolant and Motorcraft(R) Specialty Green Engine Coolant are very sensitive to light. Do NOT allow these products to be exposed to ANY LIGHT for more than a day or two. Extended light exposure causes these products to degrade.

NOTE: To install, lubricate the thermostat housing O-ring seal with clean engine coolant.
Remove the 2 bolts, thermostat housing cover, O-ring seal and thermostat.
- To install, tighten to 10 Nm (89 lb-in).

6. To install, reverse the removal procedure.
- Clean and inspect the O-ring seal. Install a new seal if necessary.

7. Fill and bleed the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding Service and Repair.