why does my Ford Explorer's fan run constantly?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

480 words

Problem Statement

Learn how to diagnose and fix the issue of a constantly running cooling fan in your Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Cooling System

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool completely before inspecting the cooling components.

Symptoms

•Cooling fan operates non-stop
•Engine temperature gauge reads normal
•Battery drains quickly when the vehicle is off
•Possible check engine light illumination
•No unusual engine noises or performance issues

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential underlying issues.
2
Inspect the coolant temperature sensor for proper operation or damage.
3
Check the fan relay and associated wiring for shorts or malfunctions.
4
Verify the operation of the engine control module (ECM) to ensure it is sending correct signals.
5
Test the fan motor directly to see if it operates outside of the ECM control.

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

•OBD-II scanner
•Socket set
•Multimeter
•Torque wrench

Parts Required

•Coolant temperature sensor
•Fan relay

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential underlying issues.
2
Inspect the coolant temperature sensor for proper operation or damage.
3
Check the fan relay and associated wiring for shorts or malfunctions.
4
Verify the operation of the engine control module (ECM) to ensure it is sending correct signals.
5
Test the fan motor directly to see if it operates outside of the ECM control.

Solution

1. Preparation

Gather tools and components needed for the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Coolant Temperature Sensor

Locate the coolant temperature sensor on the engine block or intake manifold.
Disconnect the wiring harness from the sensor.
Use a socket wrench to remove the sensor from the engine.
Install the new coolant temperature sensor and torque it to the manufacturer's specification.
Reconnect the wiring harness.

3. Check and Replace Fan Relay

Locate the fuse box and identify the fan relay using the diagram on the cover.
Remove the fan relay from its socket.
Test the relay using a multimeter; if defective, replace it with a compatible relay.
Reinstall the new relay into its socket.

4. Inspect Wiring and Connections

Visually inspect the wiring connected to the fan motor and relay for any signs of wear or damage.
Repair or replace any frayed or damaged wires.
Ensure all connectors are clean and securely attached.

5. Reconnect and Test

Reconnect the battery terminals.
Start the vehicle and observe the fan operation.
Monitor the temperature gauge to ensure proper engine operation.