why is the coolant temperature gauge not working in my Ford F-150 13th Generation (2015-2020)

Ford F-150 13th Generation (2015-2020)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

578 words

Problem Statement

Learn how to diagnose and fix the coolant temperature gauge issue in Ford F-150 (2015-2020). 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

•Allow the engine to cool before working on the cooling system to avoid burns
•Disconnect the battery before servicing electrical components

Symptoms

•Coolant temperature gauge remains at zero or does not move from the cold position
•Engine overheating warning light may illuminate
•Check engine light may be triggered
•Inconsistent or fluctuating gauge readings during operation
•No noticeable changes in engine performance or behavior

Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner for any diagnostic trouble codes (DTCs)
2
Inspect the coolant level in the reservoir and ensure it is within the proper range
3
Visually inspect the coolant temperature sensor and wiring for any signs of damage or disconnection
4
Check the electrical connector on the coolant temperature sensor for corrosion or loose connections
5
Use a multimeter to test the resistance of the coolant temperature sensor
6
Verify the operation of the instrument cluster by performing a cluster self-test if applicable

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

•New coolant temperature sensor
•Thread sealant (if applicable)

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Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner for any diagnostic trouble codes (DTCs)
2
Inspect the coolant level in the reservoir and ensure it is within the proper range
3
Visually inspect the coolant temperature sensor and wiring for any signs of damage or disconnection
4
Check the electrical connector on the coolant temperature sensor for corrosion or loose connections
5
Use a multimeter to test the resistance of the coolant temperature sensor
6
Verify the operation of the instrument cluster by performing a cluster self-test if applicable

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the negative battery cable to prevent electrical shock.

2. Inspect and Replace the Coolant Temperature Sensor

Locate the Coolant Temperature Sensor
- The sensor is typically located near the thermostat housing or on the engine block.
- Refer to the vehicle repair manual for exact location specifics.
Remove the Old Sensor
- Disconnect the electrical connector from the coolant temperature sensor.
- Use a socket wrench to unscrew the sensor from its mounting location.
- Tools Required: Socket set, wrench, and possibly a torque wrench.
Install the New Sensor
- Apply a small amount of thread sealant to the threads of the new sensor (if applicable).
- Screw the new sensor into the mounting location and tighten it to the manufacturer’s specified torque (usually around 15-20 ft-lbs).
- Reconnect the electrical connector securely.

3. Check and Refill Coolant

Inspect the Coolant System
- Check for any leaks around the sensor area or other components.
- If coolant was lost during the repair, top off the coolant reservoir with the appropriate type of coolant.

4. Reconnect Battery and Test

Reconnect the Battery
- Reconnect the negative battery cable securely.
- Ensure all tools are removed from the engine compartment before starting.
Start the Engine
- Allow the engine to reach operating temperature and observe the coolant temperature gauge for proper function.
- Monitor for any warning lights or unusual sounds.