1999 Mercedes Benz C230 blower

1999 Mercedes Benz C230 4 cyl

the blower was not working then wipper motor went out as I was cleaning snow off to put wipper motor on I notice on left side of car a hole witch I found out later was where the blower motor is I cleaned out snow and blower worked for a litter while the I had to slam door or hit dash to get blower to work now no mater what I do blower wil not turn on is there a relay out or is there somthing eles and how do I get acess to blower to see if smothing is jaming the blower wheel thanks any help you can give me would help pic or whatever