fan speed for heater/ac

Asked by Dec 28, 2014 at 12:49 AM about the 2006 Ford Taurus SE

Question type: Maintenance & Repair

Hello here is the problem, my heater and ac both work but only on high. when I try to turn
the control to a lower setting the knob turns but the air/heat comes out high only. is there
a way I can fix this or is it a sign that the fan/blower is going out? Thanks

3 Answers


First thing to check is the fuses. GMs have a separate fuse for high speed. Your car may be the same. So the fuse for the other speeds may have blown. Next, unplug the blower motor and, using a test light, see that the blower motor is getting power at all speeds. The test light should dim, but stay lit, as you go through the speed selections on the dash. If this checks out, blower motor is bad. If you only have power to the blower on high, check the resistor block. You could have a bad connection there or the resistor block may be burned out. If that checks out ok, the switch on the dash is most likely bad. HTH. -Jim

3 people found this helpful.

The blower resistor sits on top of the blower motor, and controls the lower speeds by reducing voltage to it as determined by the fan setting you select. AFAIK Fords only have one fuse for the blower motor. You should start troubleshooting at the switch, as JS above suggests. The blower motor is most likely not the problem, since you say it is working. What isn't working is the reduction in voltage required for the slower speeds, possibly indicating the resistor or selector switch as faulty. As an aside, sometimes a blower motor can draw too much current and lead to a premature death of the blower resistor.

5 people found this helpful.


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