Thermostat: Service and Repair

Thermostat





NOTE: 3.5L shown, 3.5L Gasoline Turbocharged Direct Injection (GTDI) similar.









Removal and Installation

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

2. Remove the engine Air Cleaner (ACL) outlet pipe. For additional information, refer to Intake Air Distribution and Filtering Air Cleaner Outlet Pipe.

3. Remove the 2 bolts and position aside the thermostat housing.
- On 3.5L Gasoline Turbocharged Direct Injection (GTDI) vehicles, clean the bolts and apply Thread Sealant with PTFE before installing before installing the bolts.

- To install, tighten to 10 Nm (89 lb-in).

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

5. 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: Lubricate the thermostat O-ring seal with clean engine coolant.

To install, reverse the removal procedure.

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