Thermostat Housing: Service and Repair

Thermostat Housing - 3.5L













Removal and Installation

1. Remove the thermostat. For additional information, refer to Thermostat - 3.5L [1][2]Service and Repair.

2. Disconnect the 4 coolant hoses from the thermostat housing and position them aside.

3. Remove the 2 thermostat housing bolts.
- To install, tighten to 10 Nm (89 lb-in).

4. NOTE: Do not pull the other end of the coolant tube out of the engine block when separating the thermostat housing.

Separate the thermostat housing from the coolant tube and remove the thermostat housing.

- Remove and discard the O-ring seals.

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.

To install, reverse the removal procedure.

- Lubricate the new O-ring seals with clean engine coolant.