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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 08-09-2005, 08:49 AM   #1 (permalink)
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Two weeks ago I got in my '98 528 and the blower for the automatic climate control would not turn. The fan speed was all the way to the max but no air. It was really hot in the car so I got home with the windows down. Looked around quickly and decide to look at it later.

In the evening when I got in the car, everything was working normally.

Now I got the same experience yesterday, blower off then (few hours later) everything gets back to normal. Even if I turn it off or adjust the fan speed manually, nothing seems to be working until the car has cooled down.

Both times, the car was in the sun in a high temperature day.

Has anyone ever experienced that problem? Could it be a fuse or is there a sensor somewhere?

Thanks
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Old 08-09-2005, 04:19 PM   #2 (permalink)
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I had the same problem on my '02 530i. I took it to the dealer (under warranty) and they had to replace a relay or sensor or something in the blower (sorry I can't remember which part it was). Since I got it back -- no issues.
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Old 08-10-2005, 03:20 AM   #3 (permalink)
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Is the blower speed ever erratic? I mean... does it come on full blast when it shouldn't be or anything like that?

If so, it could be the final stage unit. It's a fairly common problem.
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Old 08-10-2005, 09:40 AM   #4 (permalink)
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No, aside from those two occurences, it is working just normal. I was also thinking about a kind of relay that would fail when too hot.
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Old 08-10-2005, 01:32 PM   #5 (permalink)
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Look what I found on the Bavauto site called "Blower resistor for car with automatic air conditioning". There is a big heat sink on top of it. My guess is that this is what is causing the problem.

Anybody ever bought one of those and would know where it goes?
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Old 08-10-2005, 09:14 PM   #6 (permalink)
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The final stage resistor will make it do those syptoms it does not just make it blow sporadically. just tell the dealer you want the final stage replaced becasue the ac is not working.
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Old 08-11-2005, 10:39 PM   #7 (permalink)
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Quote:
Originally posted by paplip@Aug 9 2005, 07:49 AM
Two weeks ago I got in my '98 528 and the blower for the automatic climate control would not turn. The fan speed was all the way to the max but no air. It was really hot in the car so I got home with the windows down. Looked around quickly and decide to look at it later.

In the evening when I got in the car, everything was working normally.

Now I got the same experience yesterday, blower off then (few hours later) everything gets back to normal. Even if I turn it off or adjust the fan speed manually, nothing seems to be working until the car has cooled down.

Both times, the car was in the sun in a high temperature day.

Has anyone ever experienced that problem? Could it be a fuse or is there a sensor somewhere?

Thanks
[snapback]368467[/snapback]
Classic symptoms of the FSU failure.

The part is about $75.

It's located on the left side of the passenger footwell.
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