Hi,

I have a similar problem with my '92 500SEL. Cool air only comes out of the single vent on the driver's side and the vents between the windscreen and the dashboard. No air comes out of the front vents however, while the vents at the back (passenger cabin) work fine.

I wonder if this is a blower problem since air comes out on the driver's side and the vents behind. can anyone assist with what it may be please?

Thanks
Heavy Dee