Join Date: Dec 2000
Location: Monroe, WA, USA
ther should be a resistor in line . it is mounted on the blower box in the motor compartment. it has like a 4 or 5 wire plug in the rough shap of a triangle. if this go's bad you will eather only have low or nothing. it is normaly mounted on the A/C evaporator part of the box, well more like in it. this is too cool it so it will not burn out as fast.
the way it work's is you have a coil of wire, kinda like in a light bulb, and power go's in at what iwill call point A, poin't B,C,and D ar space down the coil. the amount of voltage the blower get's is determand by how fare down the resistor coil the power has to go before the conection is made, point's B,C, and D. they last around 20 year's normaly... hope this help's.
but do the direct curent check too. this will tell you if you have a bad motor. if the motor s good check the resistor and switch out. you have allready confermed that you have a good realay.