how do i fix the heater blower on my mercedes c220 diesel 1998 model, sometimes it works but most of the time it doesent,and my windscreen is forever misting up now that its geting colder in the morning,i know that the matrix is fine because the warm air blows through when the fan intermitantly works

chris evans, October 2008

my mercedes heater fan is not working at all what can the fault be.

braidy, November 2008

Try the duo valve infront of the fuse box. It has 2 inlet and 2 outlet pipes connected to it. Easy to remove about 10 minutes. Had same problem. Fitted a reconn one for £35 problem solved.

Ian Tennant, October 2008