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Old 06-24-2008, 02:48 PM   #1
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A/C works on 1, but not 2-3-4

Just the other day my A/C stopped working. It will work when I have the speed set to 1, but anything after that (2-3-4) and the green A/C light turns off by itself. Could this be the blower resistor? Or is this another issue?


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Old 06-24-2008, 03:16 PM   #2
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No, the blower resistor problem is when the fan works on 4 but not lower speeds.

Just a goofy suggestion, try turning on the AC, but turn off everything else electrical in the car that you can turn off, radio, lights, etc. See if it works on the other speeds then. If so, check your battery cable terminals, and the connection at the alternator- with the negative terminal removed from the battery of course so you don't go spark spark OH CRAP.

Another thing you can try is swapping the AC relay with the headlight relay. The two relays should be the same, but I don't think the AC turn on circuit is wired in with the fan. That would be weird, but not unheard of. I don't have a wiring diagram to verify.

If you verify that voltage loss is not the cause, then I'd guess the fan switch, not the resistor, is the problem.
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Old 06-24-2008, 06:29 PM   #3
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My sisters car did the same thing. I changed the resistor and have not had a problem since.
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Old 06-25-2008, 09:33 AM   #4
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sounds like the switch.and check the switch connector
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Old 06-25-2008, 03:19 PM   #5
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> but anything after that (2-3-4) and the green A/C light turns off by itself.

Does the fan still work on 2-3-4? My first guess is that it is a bad fan speed selector switch.

99% of the time if it is a blower motor resistor pack you will have high-speed (4), but not 1-2-3. So it doesn't sound like a blower motor resistor pack issue.
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Old 06-25-2008, 05:13 PM   #6
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Old 06-26-2008, 03:58 AM   #7
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Does anyone have the part number for the fan speed selector switch? I went on motorcraft.com and did a parts search, and the only thing I could find was the "Blower Switch":


I also found this on the autozone website, and it's called the "Blower/Heater Switch":


Or do I need this?:


Any help would be appreciated. I am confused which part I need.
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Old 06-26-2008, 04:27 PM   #8
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Anyone?
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Old 06-26-2008, 06:19 PM   #9
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> Anyone?

I've never done it, but since you've gotten no other responses... it looks like it is the second photo is probably what you need. It should match whatever is behind the fan speed selector switch, with that plastic shaft sticking out going into the knob.

P.S. What's with the green stuff around the fan speed selector switch? If it is from the speed selector know rubbing the finish off, that is a bit of a sign that the fan speed switch may be going bad, as a loose and worn shaft that's wobbling might indicate overheating or such..
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Old 06-26-2008, 06:49 PM   #10
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Thanks! The eBay one doesn't have A/C so I have to make sure the one I get does.

Take Care,
Derek
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