Temperature randomly changes from cold to hot with no warning. When it is cold it is very cold(45 degrees) but when you cut car off and restart rarely is it cold. After a restart it blows at 90 degrees. Have replaced blend doors and that did not seem to help. Blows same temp out of all vents(front, back, left and right). When it is blowing cold sometimes it randomly switches to heat when nothing was done to temperature settings.