why does my Ford Explorer's radiator fan run constantly

Ford Explorer Sixth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

520 words

Problem Statement

Learn how to diagnose and fix the issue of a constantly running radiator fan in your Ford Explorer. Step-by-step guide with diagnostic procedures 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 before opening the radiator or working on the cooling system.

Symptoms

•Radiator fan operates continuously even when the engine is off
•Overheating engine warning light illuminated
•Decreased fuel efficiency
•Unusual noise from the fan assembly
•High engine temperature readings on the gauge

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related issues.
2
Check the coolant level in the reservoir and radiator for proper levels.
3
Inspect the thermostat operation by testing its opening and closing.
4
Verify the functionality of the temperature sensor with a multimeter.
5
Examine the fan relay and its wiring for faults or corrosion.
6
Test the fan motor directly to ensure it operates as intended.

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
•Screwdrivers

Parts Required

•Thermostat
•Temperature sensor
•Fan relay

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any related issues.
2
Check the coolant level in the reservoir and radiator for proper levels.
3
Inspect the thermostat operation by testing its opening and closing.
4
Verify the functionality of the temperature sensor with a multimeter.
5
Examine the fan relay and its wiring for faults or corrosion.
6
Test the fan motor directly to ensure it operates as intended.

Solution

1. Preparation

Gather tools and parts needed.
Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace the Thermostat

Remove the engine cover if necessary.
Locate the thermostat housing and loosen the bolts using a socket set.
Remove the thermostat and inspect for proper operation; replace if stuck open or closed.
Reinstall the new thermostat with a new gasket, tightening bolts to the manufacturer's torque specifications.

3. Test and Replace the Temperature Sensor

Locate the temperature sensor, usually near the thermostat.
Disconnect the electrical connector from the sensor.
Use a multimeter to test resistance; replace the sensor if it’s out of specification.
Reconnect the new temperature sensor and ensure it is secured properly.

4. Inspect and Replace the Fan Relay

Locate the fan relay in the fuse box or relay panel.
Remove the relay and test it for continuity using a multimeter.
Replace the relay if it is faulty.
Reinstall the relay and ensure it clicks into place.

5. Check the Wiring and Connections

Inspect the wiring leading to the fan motor for any signs of damage or shorts.
Clean any corroded connectors and ensure they are firmly connected.
Repair or replace damaged wiring as necessary.

6. Reconnect Battery and Test

Reconnect the battery terminals.
Start the engine and monitor the fan operation to ensure it functions correctly.