You should have installed the OWC inline thermal sensor.
MacFans is the only other solution.
All you need to do to remove the GPU card and heat sink are:
1-Unplug the heat sensor (plugs straight in - on the back of the motherboard opposite the LCD heat sensor).
2-Remove the screw that holds the heat sensor to the frame in the upper right corner.
3- Remove the three screws holding the GPU to the MB.
4-Unplug the GPU from the motherboard.
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