Ford Windstar Blower Does Not Work

Hi,
I have the a problem with neither the front or rear blowers working. The relay, blower switch, blower motor all seem good. The blower motor resistor seems a little rusted but I think it works.

Also having the problem with the rear electric defrost. May be related to blower problem. Neither AC nor heat work since the blower does not come on.

What might be the problem.Thanks.