Thermostat: Service and Repair

Removal

1. WARNING: NEVER REMOVE THE PRESSURE RELIEF CAP UNDER ANY CONDITIONS WHILE THE ENGINE IS OPERATING. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN DAMAGE TO THE COOLING SYSTEM OR ENGINE AND/OR PERSONAL INJURY. TO AVOID HAVING SCALDING HOT COOLANT OR STEAM BLOW OUT OF THE COOLING SYSTEM OR DEGAS BOTTLE, USE EXTREME CARE WHEN REMOVING THE PRESSURE RELIEF CAP FROM A HOT COOLING SYSTEM OR DEGAS BOTTLE. WAIT UNTIL THE ENGINE HAS COOLED, THEN WRAP A THICK CLOTH AROUND THE PRESSURE RELIEF CAP AND TURN IT SLOWLY UNTIL PRESSURE BEGINS TO RELEASE. STEP BACK WHILE THE PRESSURE IS RELEASED FROM THE COOLING SYSTEM. WHEN CERTAIN ALL PRESSURE HAS BEEN RELEASED, PRESS DOWN ON THE PRESSURE CAP (STILL WITH A CLOTH), TURN AND REMOVE PRESSURE RELIEF CAP.

CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type If this contamination occurs, the service interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.

Drain the engine cooling system so that the engine coolant level is below the water thermostat.
2. Disconnect the upper radiator hose from the water hose connection.
3. Remove the three water inlet connection retaining bolts. Remove the water hose connection.
4. Remove the gasket and water thermostat from the water hose connection. Do not reuse gasket.

Installation
1. Install the water thermostat, gasket and water hose connection as illustrated.
2. Install and alternately tighten the retaining bolts. Tighten bolts to 10-14 Nm (89-124 inch lbs.).
3. Connect the upper radiator hose to the water hose connection.
4. Fill the cooling system Ford Extended Life Engine Coolant F6AZ-19544-AA (orange) or an equivalent DEX-COOL (R) coolant or a coolant meeting Ford specification WSS-M971344-D in a 50/50 mixture with water.
5. Start the engine and check all hoses and connections for leaks. Allow the engine to warm up so that the water thermostat opens.





6. Stop the engine. Top off degas bottle as required to maintain minimum cold fill level.