do this:
Loosen the screws holding the expansion tank so you can raise it as high as the attached hoses will allow. Loosen the clamp on the left hose as shown in the picture. They go into the firewall between the exspansion tank and the block. Pull the hose back just far enough to expose the bleed hole. Slowly pour coolant into the exspansion tank until it flows out the bleeder on the hose. Push the hose back over the bleed hole, re-tighten the clamp and re-affix the coolant tank. Tighten cap and give it a shot. (courtesy of Yippers)