A/C Compressor shuts off when Fan is on 2nd, 3rd, & 4th speed - Focus Fanatics
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Old 01-04-2014, 05:06 PM   #1
DMCH82BL8
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A/C Compressor shuts off when Fan is on 2nd, 3rd, & 4th speed

When A/C Fan/Blower switch is in 1st position, A/C Compressor kicks on, but fan doesn't blow.
When I turn switch to 2nd, 3rd, and 4th position, the fan blows like it should in each position, but it shuts the A/C Compressor off.
I replaced ALL the A/C / Heater controls on the dash, but it's still doing the same thing.
I don't know what to check next.
If anyone can shed some light on this, I'd sure appreciate it!


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Old 01-04-2014, 05:15 PM   #2
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My money is on resistor pack by blower. Had the same problem before. It is not the same typical resistor set up as the ones that went back to the Flintstones!!
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Old 01-04-2014, 05:17 PM   #3
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Wait a second! Have a hard time feeling sorry for air conditioner not working, when it is cold here!!!!
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Old 01-04-2014, 05:25 PM   #4
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It was 77 degrees here in Phoenix yesterday, not sure what it is today.

I'm trying to get this fixed before it warms up here, and it's too hot to work on my car.

I will check my repair manual for the part you mentioned.

Thanks!
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Old 01-04-2014, 07:43 PM   #5
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I ordered a new resistor. I'll post an update after I replace/install it.

Thanks for your help!
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Old 01-04-2014, 08:03 PM   #6
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The resistor won't fix it. The resistor is in there because DC electricity can't be transformed. Lower or higher voltage is what makes electric motors (of the same design) go faster or slower. In order to "transform" DC volts, you must add resistance to the circuit. When the resistor goes bad, then you'll have the fan working on speed 4, but not 1, 2, or 3.

Your problem is in the fan selector switch itself. The AC system will not run if the fan is not off. That's one way I keep my windshield clear after the car is heated up- leave it on DEF with the fan off to cut down on AC usage. If it fogs, just turn the fan on, and everything clears up in an instant. The connection in the fan switch has failed on the other speeds. I don't know why because I haven't torn one of those switches apart. Maybe after you replace it- you can disassemble yours to solve the mystery of how it works.
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Old 01-04-2014, 08:13 PM   #7
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The resistor won't fix it. The resistor is in there because DC electricity can't be transformed. Lower or higher voltage is what makes electric motors (of the same design) go faster or slower. In order to "transform" DC volts, you must add resistance to the circuit. When the resistor goes bad, then you'll have the fan working on speed 4, but not 1, 2, or 3.

Your problem is in the fan selector switch itself. The AC system will not run if the fan is not off. That's one way I keep my windshield clear after the car is heated up- leave it on DEF with the fan off to cut down on AC usage. If it fogs, just turn the fan on, and everything clears up in an instant. The connection in the fan switch has failed on the other speeds. I don't know why because I haven't torn one of those switches apart. Maybe after you replace it- you can disassemble yours to solve the mystery of how it works.
You maybe correct but, mine done the same thing. Resistor pack took care of that problem.
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Old 01-04-2014, 09:05 PM   #8
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I've already replaced the selector switch and that didn't fix it.
As a matter of fact, I replaced all of the A/C / Heater switches.

I ordered a new resistor, so I'll post the outcome after I install it.
The resistor was less than $12.00, so it's worth a try to see if it fixes the problem.
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Old 01-05-2014, 10:14 AM   #9
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ok... it doesn't make any electrical sense to me at all, but I do believe ya! I don't have time to study that circuit to see why it would behave like that- even then the cause might not be evident in the schematic.
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Old 01-05-2014, 11:29 AM   #10
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I'm gonna try the new Resistor Pack, but what doesn't make sense to me is, why does it shut the A/C compressor off when I put the blower in 2nd, 3rd, or 4th speed?

I can understand maybe one of the three settings in the resistor pack could be bad, but what would that have to do with shutting off the A/C Compressor?
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