What are the signs of a failing thermostat in the Ford Explorer Sixth Generation?

Signs of a Failing Thermostat in the Ford Explorer Sixth Generation (2020-Present)

When the thermostat in your Ford Explorer fails, it can lead to several engine performance issues. Below are the common symptoms indicative of a failing thermostat:

Tools Required

• OBD-II scanner (for checking engine codes)
• Infrared thermometer (for temperature checks)
• Basic hand tools: socket set, wrenches, screwdrivers
• Coolant catch pan
• Safety goggles and gloves
• Torque wrench (if applicable)

Repair Instructions

Step 1: Preparing for Replacement

1. Safety First: Ensure the engine is completely cool. Put on safety goggles and gloves.
2. Disconnect the Battery: Remove the negative terminal from the battery to prevent electrical shorts.

Step 2: Draining Coolant

1. Place Coolant Catch Pan: Position a catch pan under the radiator.
2. Drain Coolant: Open the radiator drain valve and allow coolant to flow into the pan. Close the valve once drained.

Step 3: Remove the Thermostat

1. Locate the Thermostat: The thermostat is usually located at the engine end of the upper radiator hose.
2. Disconnect Hoses: Loosen the hose clamps and remove the upper radiator hose connected to the thermostat housing.
3. Remove Thermostat Housing Bolts: Using a socket set, remove the bolts securing the thermostat housing. Keep track of the bolts.
4. Remove the Thermostat: Carefully remove the thermostat from the housing. Inspect the old thermostat for signs of damage or corrosion.

Step 4: Install New Thermostat

1. Clean the Surface: Clean the mating surfaces of the thermostat housing and engine to ensure a good seal.
2. Install New Thermostat: Place the new thermostat into the housing, ensuring it is oriented correctly (usually with the spring side facing the engine).
3. Reattach the Housing: Place the thermostat housing back and secure it with bolts. Use a torque wrench to tighten bolts to the manufacturer’s specifications.
4. Reconnect Hoses: Reattach the upper radiator hose and secure it with the hose clamp.

Step 5: Refill Coolant

1. Refill the Cooling System: Slowly refill the radiator with fresh coolant. Refer to the owner’s manual for the correct type and mixture ratio.
2. Bleed the System: Start the engine with the radiator cap off and run it until the thermostat opens (you may hear a change in pitch). This allows trapped air to escape.

Step 6: Testing

1. Reconnect the Battery: Reattach the negative battery terminal.
2. Start Engine: Start the engine and monitor the temperature gauge.
3. Check for Leaks: Inspect for any leaks around the thermostat housing and hoses.
4. Test Heater Function: Turn on the heater to confirm it blows warm air.

Step 7: Final Checks

1. Recheck Coolant Levels: After the engine has cooled down, check the coolant level and top off if necessary.
2. Dispose of Old Coolant Properly: Ensure that you dispose of old coolant in accordance with local regulations.

Conclusion

If you notice any of the symptoms of a failing thermostat in your Ford Explorer, it is crucial to address the issue promptly to avoid engine damage. Following the diagnostic and repair steps outlined can help you effectively replace the thermostat and restore your vehicle’s cooling system functionality.