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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 05-27-2011, 02:05 AM   #1 (permalink)
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A/C button question

Just a quick question about the A/C button. Mine does not illuminate except for a second or two occasionally right when I start the car. I've never heard the compressor kick in when I press the button, but, I also don't know if the button is bad. I assume that the button acts just like any other switch, in that if illuminated, the circuit should be open, and if not illuminated, the circuit should be closed? Might it be that my switch just doesn't work?
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Old 05-27-2011, 02:20 PM   #2 (permalink)
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Relay? or fauly pump...
Just an idea
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Old 06-06-2011, 06:04 AM   #3 (permalink)
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I am not an expert in A/c circuits. May be problem with switch light or A/C clutch engagement wires. Not quite sure, Just my thoughts.

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Old 06-25-2011, 10:53 PM   #4 (permalink)
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Originally Posted by 6670charger View Post
Just a quick question about the A/C button. Mine does not illuminate except for a second or two occasionally right when I start the car. I've never heard the compressor kick in when I press the button, but, I also don't know if the button is bad. I assume that the button acts just like any other switch, in that if illuminated, the circuit should be open, and if not illuminated, the circuit should be closed? Might it be that my switch just doesn't work?
My AC quit after a month of intermittent operation. I know there was a good charge, as it was cold when it did engage, so I spent several months screwing with the switch, replacing the relay, etc. All three switches on the panel quit working.

It turned out to be a faulty HVAC computer. I put in a used switch panel and voila!, it works perfectly. You can hang meat in the car. The Bentley manual does not even refer to it as such, just as the IKD box (not exactly right, but I don't have access to my records as I am out of town). It is located near the pollen filter in front of the center console in the car.
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Old 06-26-2011, 10:49 AM   #5 (permalink)
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Well, the problem with mine is that the AC hasn't worked since I bought the car. It could be the computer, the switch, or a host of other things, and probably a combination of them.

I never gets that hot in Germany, so it really doesn't matter that much. I'll only have the car for another 9-10 months anyway and then time to pass it on to someone else.
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Old 06-27-2011, 12:22 AM   #6 (permalink)
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Originally Posted by 6670charger View Post
Well, the problem with mine is that the AC hasn't worked since I bought the car. It could be the computer, the switch, or a host of other things, and probably a combination of them.

I never gets that hot in Germany, so it really doesn't matter that much. I'll only have the car for another 9-10 months anyway and then time to pass it on to someone else.

Is that second handed one? It could be anything relay? switch?compressor? need more info.
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