If you have the original version of the MacBook Air (A1237), refer to picture 1. Remove the following screws securing the heat sink to the logic board:

One 5.9 mm Phillips screw.

Two 1.9 mm Phillips screws.

One 1.9 mm Phillips screw.

If you have the A1304 version of MacBook Air, refer to picture 2. Remove the following screws securing the heat sink to the logic board:

One 5.0 mm Phillips screw

Five 1.9 mm Philips screws.

One 2.5 mm Phillips screw.