Mercedes Benz C280 Vent

My Heat In The Car Only Blows On The Front Window And The Two Side Vents.it Doesnt Work On The Feet Or The Center Vents I Call The...

When I Press The Vent Selector Button, It Does Not Change. The Vent Is Always Blowing On The Windscreen And Front Vents Only. So During The...

I Have A 1994 C280 That I Had Serviced For Ac. The Cold Air Comes Out Of The Center Vent But, Hot Air Is Coming Out From The Left (driver...