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HI Get a test lamp.With blower control switch on high ,remove power wire from blower motor,see if you have power at wire ,if not check for power at blower resister which is mounted next to fan motor.You should have power on two wires,one coming from switch the other going to fan.If you have power going to resister ,the resister is bad ,if no power to resister, switch has a problem Good Luck
you have a bad connection go under the hood left side upper fire wall the plastic houseing where the blower motor is housed unplug larger conector 4- 5 wire clean with conect cleaner or fine sand paper you should be fine
Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.
I had the same problem with mine and I replaced the blower motor, and still didn't work. The problem ended up being the blower motor control module. I have the auto temp control, so my replacement part was pretty expensive. Found a used one online fairly cheap. Hope this helps.