December 16, 2023

Acura CL Cooling Fan Isn’t Turning Off – Let’s Test and Fix

Acura CL cooling fan switch stuck

If the cooling fan switch is permanently stuck, this is common on the 2001. This can lead to various problems, including battery drain.  I’ll share my experience with this and you how to test and replace the cause.  I’ll also refer to relevant OBD codes.

Check for Recalls

The Problem

In mine, I noticed that the cooling fan wouldn’t shut off, even after the engine was turned off. This led to the battery being drained repeatedly. Initially puzzled, but soon realized this was a common issue with this model.

Troubleshooting

Check the Cooling Fan Relay

  • Locate the relay: It’s in the fuse box under the hood.
  • Test the relay: Swap it with another similar relay.

Inspect the Fan Switch

  • Location: It’s typically near the thermostat.
  • Check for damage: Look for any visible signs of wear or damage.

Test the Cooling Motor

  • Direct power: Apply direct power to the motor. If it doesn’t work, the motor is the issue.

The Thermostat

  • A faulty thermostat can cause the fan to run continuously.

Inspect Wiring and Connectors

  • Look for damage: Check for any damaged wires or loose connections.

Check the Engine Temperature Sensor

  • Sensor location: Find it near the thermostat housing.
  • Testing: Use a multimeter to test its resistance.

Replacing the Fan Switch

  • Wrench set
  • Screwdrivers

Steps

  1. Disconnect the Battery: Safety first. Disconnect the negative terminal.
  2. Locate the Fan Switch: It’s usually near the radiator.
  3. Remove the Old Switch: Unscrew and gently remove it.
  4. Install the New Switch: Install the same as the old switch.
  5. Reconnect the Battery: Reattach the negative terminal.

OBD Codes

Some OBD-II codes related to cooling system issues include:

  • P0115: Engine Coolant Temperature Circuit Malfunction
  • P0117: Engine Coolant Temperature Circuit Low Input
  • P0118: Engine Coolant Temperature Circuit High Input
  • P0480: Cooling Fan 1 Control Circuit Malfunction

See all the OBD codes here.

Final Thoughts

A lot of this is a DIY item for most. If you’re not sure however, always consult a professional mechanic about any step.

Additional Tips

  • Keep a record: Document any changes or repairs you make.
  • Regular maintenance: Regularly check your cooling system to prevent future issues.
  • Consult the manual: Refer to your Acura’s manual for specific instructions and diagrams.

This experience taught me the importance of understanding my vehicle’s systems and being proactive in maintenance. With the right approach and tools, resolving such issues can be straightforward and rewarding.

Cars, like any other complex machinery, are prone to common problems that may arise from time to time. From engine troubles to electrical issues, these problems can be frustrating and inconvenient for car owners. However, on the bright side, we are here to help. Our team of experts is well-equipped to identify these common problems and provide you with the necessary assistance to resolve them. Whether it’s diagnosing engine malfunctions, troubleshooting electrical glitches, or addressing common maintenance issues, we are committed to ensuring that your car runs smoothly and efficiently. With our expertise and dedication, we aim to make your car ownership experience as hassle-free as possible.