Mercedes e320 ac not working

When you press "Auto" on the control panel you may see the a/c graph bars on the panel but the a/c does not work. Replace the "a/c blower regulator." But, also disconnect the a/c blower from the a/c blower regulator and connect it to 12v battery to see if it works (watch your fingers). If it does work the blower does not need to be replaced. If the a/c blower does not work connected to 12v battery you will need to change it. Order one with the harness connector (much easier to connect). Also order the mounting bracket. Eckler mbz (MERCEDES BENZ) parts has great prices for do it yourself individuals. And, "mercedez benz forums" has pics on how to fix just about anything.