2000 Oldsmobile Silhouette Power sliding door will power open but will not power close Does anybody know why this would happen It is very cold where I live could that be a factor?

If the sliding door attempts to power close but won't hitch, there could be a problem with the hitch mechanism on the back of the sliding door. Look for a greased metal "hook" at the back of the door while the door is opened. It should be in an opened position (ready to catch the rear hitch). If not, you can flip it into the opened position with a screwdriver (and apply a silicon grease). Another problem may be the lower track cover to the door itself. If this rubber strip comes undone or curls under, the door "senses" the resistance and won't completely close.