A/C not working possible resons why?

30

Asked by Apr 19, 2010 at 08:05 PM about the 2002 BMW 5 Series 525i Sedan RWD

Question type: Maintenance & Repair

So the air conditioner wont go on and the display panel says its on full blast.
i looked under the hood and nothing seems to be wrong.
it makes a sound where the two filters on the side are when i try to turn it on but no air comes out.
so if someone can help me out and give me reasons why it isn't blowing please let me know id really appreciate it.

2 Answers

2,335

The Final Stage Unit (FSU) needs to be replaced. This is a rather common failure with our e39 chassis. The FSU is a resistor/heat sink that controls the blower speed of the ventilation system. When this unit fails, the blower speed cannot be controlled (completely shuts down in your case) by the clinmate control panel. Fortunately, BMW has since come up with a sturdier direct replacement. This part costs around CAD$85 and is a very simple DIY job. Follow this link for detailed instructions: http://www.bimmerfest.com/forums/showthread.php?t=143393 and be sure to have your physiotherapist's phone number handy as your neck may need attention.

10 of 10 people found this helpful.
30

Another question. Where can I find this part? And is it easy to install?

3 of 3 people found this helpful.

Your Answer

BMW 5 Series Experts

  • #1
    Tom Demyan
    Reputation
    2,230
  • #2
    Michael Branan
    Reputation
    820
  • #3
    Robert Charlson
    Reputation
    700
View All

Related Models For Sale

Used BMW 3 Series
1,154 Great Deals out of 34,385 listings starting at $1,000
Used BMW 7 Series
140 Great Deals out of 5,221 listings starting at $2,995
Used Mercedes-Benz E-Class
534 Great Deals out of 21,851 listings starting at $1,999
Used BMW X5
386 Great Deals out of 16,742 listings starting at $2,800
Used BMW 6 Series
65 Great Deals out of 2,367 listings starting at $5,995
Used BMW M5
6 Great Deals out of 538 listings starting at $8,500
Used Mercedes-Benz C-Class
773 Great Deals out of 26,295 listings starting at $1,595
Used Audi A6
162 Great Deals out of 7,666 listings starting at $900
Used Mercedes-Benz S-Class
116 Great Deals out of 7,535 listings starting at $1,200
Used BMW M3
34 Great Deals out of 1,877 listings starting at $5,495
Used Honda Accord
858 Great Deals out of 88,771 listings starting at $1,444
Used Audi A4
242 Great Deals out of 12,249 listings starting at $1,450

Used Cars For Sale

2018 BMW 5 Series For Sale
16 Great Deals out of 4,596 listings starting at $47,000
2017 BMW 5 Series For Sale
23 Great Deals out of 614 listings starting at $39,981
2016 BMW 5 Series For Sale
24 Great Deals out of 473 listings starting at $21,599
2015 BMW 5 Series For Sale
62 Great Deals out of 2,205 listings starting at $15,000
2014 BMW 5 Series For Sale
127 Great Deals out of 1,865 listings starting at $13,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.