did u try bypassing the relay to see if the motor blows? if it doesnt then I would think its not the relay but the blower or if it blows but not via the relay then it should be the relay. Takes some time but its only be a very few things
1989 Brougham a/c fan problem
HELP!!! The fan for the ventilation system just quit. The fuse is fine. The compressor turns on, but there is no blower in a/c, vent, heat etc. What could it be? Is it a relay or a blower motor? How can I tell? 
