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Dell Latitude 3420 Fan Replacement

Collin Roque and 2 other contributors

Last updated on Dec 23, 2025

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15 - 20 minutes

Easy

Introduction

Go to step 1 ↓

If your Latitude 3420 is running hot, making loud sounds, or shutting down from overheating, the internal fan might need to be replaced. The fan keeps your laptop cool by moving heat away from the processor. A failing fan can damage other parts if left unfixed. This repair requires opening the laptop, disconnecting the fan cable, removing the fan assembly, and installing a new cooling unit. Once it is secured and plugged back in, reassemble the laptop.

What you need

Tools

1. Step 1 Lower Case
  Shut down the laptop and disconnect all peripheries before beginning.
  
  Close the laptop lid and set the laptop down with the lower case facing you.
  
  Use a Phillips #00 screwdriver to remove the seven 7 mm-long screws securing the lower case.
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2. Step 2
  Insert an opening tool into the seam between the lower case and chassis.
  
  Pry around the entire perimeter until the lower case fully releases.
  
  Remove the lower case.
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1. Step 3 Battery
  Remove the five 3 mm-long Phillips screws securing the battery.
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3. Step 4
  Use an opening tool to gently push the battery connector directly out of its motherboard socket.
  
  Disconnect the second cable by pushing the connector toward the battery as well.
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4. Step 5
  Slowly lift the battery out of the laptop housing.
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1. Step 6 Fan
  Remove the sliding connector for the wire connected to the fan.
  
  Remove any adhesives keeping the fan down as well.
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2. Step 7
  Remove the two 3 mm-long Phillips screws that secure the fan.
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3. Step 8
  Remove the fan by lifting it away from the computer.
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Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.

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