How to Replace a Laptop Fan (Check the Part First)

On a lot of laptops, swapping the fan is one of the easier repairs: a bottom cover, a few screws, and one small plug. On others the fan is built onto the heatsink, so you’re also redoing thermal paste. The part you order decides which job you’ve got, so I sort that out before anything else.

Step 1: Find the exact part

Fans that look alike often have a different connector, cable length, or screw layout.

• Model number: on the bottom sticker or in system info (run “msinfo32” on Windows).
• Part number: often printed on a label on the fan itself. Lenovo, HP, and Dell list fan part numbers for many models on their parts and support sites. For example, iFixit’s ThinkPad T16 Gen 3 guide lists Lenovo’s fan and heatsink assembly part numbers.
• Two fans? Gaming and bigger laptops often have a CPU fan and a GPU fan. Your maker’s fan test usually tells you which one failed.
• Match the connector, the screw holes, and whether the listing is “fan only” or “fan with heatsink.”

Step 2: Fan only, or fan and heatsink?

Fan only: the fan is held by its own screws and lifts out without touching the heatsink. No new thermal paste needed.

Fan and heatsink assembly: the fan is fixed to the heat pipes, so the whole thing comes off the processor. This is common on thin laptops. iFixit’s guides for the ThinkPad T14 Gen 3 and Surface Laptop 4 both remove the fan this way. You’ll need to clean off the old paste and apply fresh paste when it goes back on. Some new assemblies come with paste and pads already applied. iFixit notes Lenovo’s T16 Gen 3 assembly does.

Step 3: Safety first

• Shut down fully and unplug the charger.
• Remove the bottom cover with the right bit from precision screwdriver set. Keep screws in order. Different lengths often go in different holes.
• Disconnect the battery before touching anything else. On some laptops that means removing the battery entirely. iFixit’s Surface Laptop 4 guide also says to let the battery drain below 25% first, since a charged battery is riskier if damaged.
• Follow anti-static habits that matter.

Step 4: Disconnect the fan carefully

This is where most damage happens. Fan cables use one of two connector types.

• Small plug: use the point of a spudger to push on alternating sides and “walk” it out of the socket. iFixit’s ThinkPad guides say it can take a lot of back-and-forth. Don’t pull on the wires.
• ZIF ribbon connector: flip up the small locking flap first, then slide the ribbon straight out.

Snap a photo before you unplug it so you know which way it goes back in.

Step 5: Swap the fan

Fan only

• Remove the fan’s screws.
• Peel back any tape holding nearby cables to the fan, and save it if you can.
• Lift the old fan out and set the new one in the same position.
• Put the screws back and reconnect the cable firmly.

Fan and heatsink assembly

• Remove the heatsink screws. Many are captive and stay in the heatsink. If they’re numbered, loosen them in reverse order, highest number first.
• Lift the assembly by its edges. Old paste can make it stick. Pry gently, and don’t bend the heat pipes.
• Clean the old paste off the processor with isopropyl alcohol on a cotton swab or lint-free cloth. Don’t pour it on.
• Apply new paste (unless the new assembly has it pre-applied), and replace any thermal pads.
• Set the assembly down straight and tighten the screws in number order, a little at a time.

For paste and pads, see thermal paste and pads.

Step 6: Test before you close it

• Reconnect the battery and charger, but leave the bottom cover off if it’s safe to run that way on your model.
• Boot up and run the maker’s fan test.
• Put it under load and watch temperatures. They should level off, not keep climbing.
• Power off, put the cover back on, and test once more.

When to use a shop

• It’s still under warranty.
• It’s a MacBook or a model where the fan sits under the motherboard.
• A new fan still fails the test, which can mean a motherboard problem.
• The battery looks swollen. Stop and see swollen laptop battery.

Still too loud or hot after the swap? Go back to laptop fan loud or always running and laptop running hot.