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X5 E53 (1999 - 2006)
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Old 08-27-2011, 02:41 PM
chicolonga chicolonga is offline
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Location: Bakersfield
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Mein Auto: BMW X5 2003
Cool Final Stage Unit / Final Stage Resistor

What does the Final Stage Unit or Final Stage Resistor Do? Is there only one function?

I found conflicting evidences here regarding the true function of the FSR. One thread states that it is only linked to the Blower and regulates the blower speed. Surely it has to have more function than that. For those who have good knowledge on this pls shed light. I also noticed that people who have defective FSR have different symptoms, how is that? Im a newbie to this forum. Thanks in Advance.
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Old 09-29-2011, 12:00 PM
BimmerNutX5 BimmerNutX5 is offline
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Location: Michigan
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Mein Auto: 2002 X5, 1995 525i

Try reading this post.

1981 320i (sold)
1986 635csi (sold)
1995 525i (Daughter's car)
2002 X5 3.0i (Wifes Car)
2006 Jeep Grand Cherokee Limited, 5.7L Hemi, Quadradrive II, KYB Suspension, Magnaflow exhaust, Cold Air Intake. This is my current vehicle.
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Old 04-18-2012, 07:01 PM
533-3.8 533-3.8 is offline
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Mein Auto: 1988 325ix '88 325ix
That's what I noticed different symptoms same answer, so I changed mine, someone was quick to give a solution without really hearing the problem.
'84 533i sold 5spd
'88 325ix sold 5spd
'89 325ix sold auto
'04 x5 3.0 (159k) auto
'05 325xi 120k auto
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Old 10-01-2012, 04:26 AM
oz striker oz striker is offline
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Location: London, UK
Join Date: May 2010
Posts: 28
Mein Auto: '00 330Ci, '07 350Z
You fellas may find this useful:

So essentially it provides a constant resistance to regulate the fan speed, and i guess as its failing the resistance it provides varies (hence fluctuating fan speed), but gradually drops with time.

Last edited by oz striker; 10-01-2012 at 04:31 AM.
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