how to fix a malfunctioning thermostat in Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

562 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a malfunctioning thermostat in Ford Explorer (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Cooling System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool completely before opening the cooling system to prevent burns.

Symptoms

•Check engine light illuminated
•Engine overheating
•Inconsistent temperature gauge readings
•Poor heater performance
•Coolant leaks around the thermostat housing

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related trouble codes.
2
Inspect the coolant level and condition in the reservoir; ensure it’s at the appropriate level.
3
Check the temperature gauge on the dashboard for erratic readings during engine operation.
4
Feel the upper radiator hose for temperature; it should be hot if the thermostat is functioning correctly.
5
Physically inspect the thermostat housing for signs of leakage or damage.
6
Test the thermostat by removing it and placing it in hot water to see if it opens at the specified temperature (usually around 195°F to 220°F).

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Socket set
•Torque wrench
•Screwdrivers
•Pliers
•OBD-II scanner
•Thermometer

Parts Required

•New thermostat
•Thermostat gasket or sealant
•Coolant

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related trouble codes.
2
Inspect the coolant level and condition in the reservoir; ensure it’s at the appropriate level.
3
Check the temperature gauge on the dashboard for erratic readings during engine operation.
4
Feel the upper radiator hose for temperature; it should be hot if the thermostat is functioning correctly.
5
Physically inspect the thermostat housing for signs of leakage or damage.
6
Test the thermostat by removing it and placing it in hot water to see if it opens at the specified temperature (usually around 195°F to 220°F).

Solution

1. Preparation

Gather tools and parts required for the repair.
Tools Required:
- Socket set
- Torque wrench
- Screwdrivers
- Pliers
- OBD-II scanner
- Thermometer (for testing thermostat)
Parts Required:
- New thermostat
- Thermostat gasket or sealant
- Coolant (if needed)

2. Remove the Old Thermostat

Step 1: Allow the engine to cool completely before starting the repair.
Step 2: Disconnect the negative battery cable to prevent electrical shorts.
Step 3: Drain the coolant from the radiator by opening the drain valve or removing the lower radiator hose.
Step 4: Locate the thermostat housing (usually near the upper radiator hose connection).
Step 5: Remove the bolts securing the thermostat housing using a socket set and gently pull the housing off.
Step 6: Remove the old thermostat and gasket from the housing.

3. Install the New Thermostat

Step 1: Clean the mating surfaces of the thermostat housing and engine block to remove any old gasket material.
Step 2: Place the new thermostat in the housing, ensuring it is oriented correctly (the spring side should face the engine).
Step 3: Install a new gasket or apply sealant as necessary to prevent leaks.
Step 4: Reattach the thermostat housing and tighten the bolts to the manufacturer’s torque specifications (typically around 15-20 ft-lbs).
Step 5: Reconnect the upper radiator hose and ensure all connections are secure.

4. Refilling the Cooling System

Step 1: Refill the radiator with the appropriate type and mixture of coolant.
Step 2: Start the engine and let it reach operating temperature while checking for leaks around the thermostat housing.
Step 3: Allow air to bleed from the system by running the heater on high and checking the temperature gauge.