98 S500 Blower Motor help?

[HoustonM3]

Hey guys the A/C is not blowing in my car and was told by the dealer ( about 4 months ago ) when it did the same thing that the blower motor was bad. They lubed it and it worked for another 4 months. Now I am just not sure if I need the new blower motor and the regulator ? Any ideas? They said it was the blower motor but I will be doing this repair myself. Thanks