Dell XPS 8950 Service Manual page 49

NOTE: The processor fan and heat-sink assembly consists of one fan and one heat sink that is linked by tubing containing
water. Ensure that there is no damage to the tubing and there is no leaks before replacing the processor fan and heat-sink
assembly
NOTE: This procedure only applies for computers shipped with a 125 W processor.
The following image(s) indicate the location of the processor fan and heat-sink assembly (125 W) and provides a visual
representation of the installation procedure.
Steps
1. Place the heat sink on the system board and align the captive screws to the screw holes on the system board.
2. Tighten the four captive screws that secure the heat stink to the system board.
3. Place the processor fan on the chassis and align the screw hole on the fan to the screw hole on the chassis.
4. Replace the screw (M3x5) that secures the fan to the chassis.
5. Connect the processor fan and heat-sink assembly fan cable to the system board.
6. Connect the processor-fan pump cable to the system board.
7. Place the computer in an upright position.
Next steps
1. Install the left-side cover.
2. Follow the procedure in After working inside your computer.
Removing and installing components 49