You may have a Blender problem. Some early rx have 2 blenders one for controlling vents and one for controlling amount of heat to blend the cold air warmer. My modle (1999) has 2, located under glove box. Remove glove box and have a sm. flexible Philips screwdriver and small arms to replace. You might see/test if control arm on cabel is activating blender functions Before removing either blender. Find your modle Instructions before anything but getting a Lexus mechinic, Good luck.