Please help w/ w124 ......its hot!!!!

[56speedster]

i have a '91 w124 and just went to run an errand and the blower started to blow and then stopped. i played with the buttons during the trip . pushed the vent button and a little bit of air came out when put on a/c but a very minimal amount of air came out but it was much colder.
the car has 71k and already has had the ac evaporator replaced. do you think this could be a fuse????? or a blower motor???
i just replaced a fuse last week.
i looked at the fuse and it had some oxidation on it. do not have any extra fuses here!!!
if blower motor.....is it expensive fix????