Volkswagen Golf Seventh Generation (2013-2020) why is my engine coolant fan running constantly

Volkswagen Golf Eighth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

604 words

Problem Statement

Learn how to diagnose and fix the issue of a constantly running engine coolant fan in Volkswagen Golf (2013-2020). Step-by-step guide included.

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.

Symptoms

•Engine coolant fan operates continuously, even when the engine is cold
•Dashboard warning lights may illuminate (e.g., check engine light)
•Engine overheating or running at higher than normal temperatures
•Reduced fuel efficiency
•Unusual sounds from the fan or cooling system
•Possible coolant leaks around the radiator or hoses

Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner to check for any error codes related to the cooling system.
2
Inspect the coolant level and quality in the reservoir and radiator.
3
Check the operation of the temperature sensor by measuring resistance at specific temperatures with a multimeter.
4
Verify the functionality of the engine control module (ECM) by checking for updates or faults.
5
Inspect wiring and connections to the coolant fan and temperature sensor for any signs of damage or corrosion.
6
Test the cooling fan relay for proper operation by swapping it with a known good relay if available.

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
•Torque wrench
•Multimeter
•Pliers

Parts Required

•Coolant (as per manufacturer specifications)
•Temperature sensor
•Cooling fan relay

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Symptoms

•Engine coolant fan operates continuously, even when the engine is cold

•Dashboard warning lights may illuminate (e.g., check engine light)

•Engine overheating or running at higher than normal temperatures

•Reduced fuel efficiency

•Unusual sounds from the fan or cooling system

•Possible coolant leaks around the radiator or hoses

Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner to check for any error codes related to the cooling system.
2
Inspect the coolant level and quality in the reservoir and radiator.
3
Check the operation of the temperature sensor by measuring resistance at specific temperatures with a multimeter.
4
Verify the functionality of the engine control module (ECM) by checking for updates or faults.
5
Inspect wiring and connections to the coolant fan and temperature sensor for any signs of damage or corrosion.
6
Test the cooling fan relay for proper operation by swapping it with a known good relay if available.

Solution

1. Preparation

Gather all necessary tools and parts before starting the repair.
Ensure the vehicle is parked on a flat surface, and the engine is cool.
Disconnect the negative terminal of the battery to prevent electrical shock.

2. Check Coolant Level

Sub-steps:
- Locate the coolant reservoir under the hood.
- Remove the cap and check the coolant level; it should be between the minimum and maximum marks.
- If low, add the appropriate coolant mixture (usually a 50/50 mix of antifreeze and distilled water).

3. Replace Temperature Sensor

Tools Required: Socket set, torque wrench, pliers
Sub-steps:
- Locate the temperature sensor, typically near the thermostat housing.
- Disconnect the electrical connector and remove any securing clips.
- Unscrew the old sensor using the socket set.
- Apply thread sealant to the new sensor and install it, tightening to the manufacturer's specified torque.
- Reconnect the electrical connector.

4. Inspect and Replace Cooling Fan Relay

Sub-steps:
- Locate the fuse box and remove the cover.
- Identify the cooling fan relay based on the diagram inside the fuse box cover.
- Pull out the relay and inspect it for signs of damage or corrosion.
- Replace it with a new relay, ensuring it is seated securely.

5. Reconnect Battery and Test

Reconnect the negative battery terminal.
Start the engine and monitor the cooling fan operation.