I am not too sure about the front one but I can tell you that the rear blower has a relay that is activated whenever the ignition is on by the thin blue lead. The orange or pink ones which are very thick(one of them is ground so be careful because the ground is what the control switches use along with watt resisters to provide current to the fan motor) anyway the orange or pink wire goes straight to the right side of the battery where there is a fusible link connected to a secondary
battery terminal (not sure what is is but it looks like a serious current relay). It is on the right side of the battery and is only an inch away from the positive battery terminal. Be sure to disconnect the negative battery lead before trying to check anything. I accidentally blew the fusible link and had to take the battery out to get it repaired. The relay for the rear fan is located about 7 inches below the rear fan control and to the right at 4 o clock angle and it is a transistor type relay on my 93 aerostar, for the front I would check both electrical leads to the blower motor for both +12v and ground though.
Thursday, February 26th, 2009 AT 2:35 PM