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 Service and Repair.

2. Remove the engine Air Cleaner (ACL) 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: Use Motorcraft(R) Specialty Green Engine Coolant or Motorcraft(R) Specialty Orange Engine Coolant. Use the same type of coolant that was originally used to fill the cooling system. Do not mix coolant types. Mixing coolant types degrades the coolant corrosion protection and may damage the engine or cooling system.

NOTICE: Motorcraft(R) Specialty Green Engine Coolant is very sensitive to light. Do NOT allow this product to be exposed to ANY LIGHT for more than a day or two. Extended light exposure causes this product 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 Service and Repair.