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Old 06-29-2008, 05:10 PM   #11
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I replaced the speed switch today and it still does not work. What next - blower resistor?
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Old 06-29-2008, 05:49 PM   #12
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> What next - blower resistor?

It's beginning to sound like a potential motor problem to me, but since that is a more expensive and time-consuming activity, you don't want to throw parts at it.

I would pull the blower resistor and (a) visually inspect it and (b) test it using the resistance function of a multi-meter combined with a wiring diagram.

Using the wiring diagram, I would also use the voltage function of the multimeter to test the connector to the fan resistor to see if voltage is appearing on the appropriate terminals as the new selector switch is moved to different positions. It is possible there is a problem in the wiring harness or connector, such as a burnt-open wire or two, e.g., if you find a melted connector to the resistor pack, well... there's a sign.

Again, the key is to use the wiring diagram to determine what should be happening in terms of voltage at various switch positions, and then to test, using the multimeter, to determine where the voltage goes missing.
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Old 07-07-2008, 12:43 PM   #13
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I had the exact same problem. The problem I had was the AC and AC light on button would turn off when I would turn the fan speed anything past 1. So the AC would shut down if I turned the fan speed to: 2,3 or 4. O changed the blower moter resister right behind the glove box. The Blower moter resister cost me around $20 bucks and took 5 minutes to locate it unintall the old and replace with the new one. I found the answer on this site.
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Old 08-08-2008, 02:54 PM   #14
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UPDATE: Installed a new blower resistor pack today ($15). It works now.
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Old 08-11-2008, 10:50 AM   #15
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Had the same problem with mine except the switch Thermally Broke down and caught fire resulting burning out the whole Resistor pack.. a visit to my Local Buddies Ford Dealer and $73 bucks later a new switch plus resistor pack.. Had a fun time replacing the switch The resistor pack was easy, never had a problem since then..

I opened up the switch it seems there was foreign material that was stuck to the switch terminals which caused it to arc, eventually causing it to overheat on #3 setting ( Always wondered why there was a burning plastic smell) and when it finally did it fused #3 to the main and it separated off the knob shorting 1-3 and the resistor pack :)
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Old 01-19-2009, 04:46 PM   #16
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Heater Fan only works on setting 1. Does not work on setting 2, 3, and 4

I was able to fix this today thanks to your posts. The part number that I had to change was YS4Z-18578-AB. This is the Blower / Heater Switch that is behind the fan control.
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Old 01-19-2009, 05:04 PM   #17
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yup the majority of the time its "USUALLY" the resistor pack or the speed selector switch
rare occasion it will be an actual blower motor problem/wiring problem
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Old 06-12-2018, 10:26 PM   #18
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Fix for AC on only at lowest speed

I just had the same issue on my wife's 2002 Focus ZTS. Replacing the resistor fixed it. So to confirm, my issue was: Blower was fine at all speeds but AC light would only stay on at lowest blower speed, would go out at higher speeds. Resistor is very easy to replace, pop open glove box from side retainers, undo one screw and one connector, replace with another $15 resistor.
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Old 06-12-2018, 11:38 PM   #19
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Thank you Horack. It is always good to hear personal experiences about any fix of any system. Your input helps future lookers and other FF members.

Cheers!
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Old 05-29-2019, 07:16 AM   #20
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Talking

I had a similar issue with my 05 Focus:

Blower worked on 2-3-4 (I suspect it was just spinning extremely slowly on 1)
AC only worked on 1

Replaced the resistor yesterday and it solved both problems.
cheap sleeper and Marde like this.
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