For access, remove this FRU:

• Removable battery
• Base cover assembly

Installation and Removal steps of the thermal fan assembly

1. Loosen the screws [1] in ascending alphabetical order ( [a] to [d] ) as illustrated.
   
2. Release the cables from the cable holder on the thermal fan assembly.
   
3. Remove the thermal fan assembly.
   

When installing:

• Always wear fingerstalls when handling the thermal fan assembly. Do not touch or hold any part of the thermal fan assembly with bare fingers.
• Before you attach the thermal fan assembly to the computer, apply thermal grease, at an amount of 0.2 grams, on the part marked [a] as shown in the following illustrations. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component.
  
• Do not touch the thermal grease.
• Do not press, touch, or rotate the fan impeller.
• Do not touch the fan inlet hole.
• Do not twist or pull the cable of the thermal fan assembly.
• Do not apply pressure on the top and base covers of the thermal fan assembly.
• Do not press the heat pipe. Hold both sides of the heat pipe when you take the thermal fan assembly.
• Do not shake or drop the thermal fan assembly.
• Ensure that the fan connector is attached firmly.
• Replace the thermal fan assembly if you observe the following:
  
  
  • The cover of the thermal fan assembly is deformed or damaged.
  • There is abnormal noise during rotation.