AC acting up

M5_SMG · 2005-07-04

Got an intermittent problem with the AC. When I run it low (3-5 lights), afterawhile the speed of the AC blower drops so theirs hardly any air coming through the vents. The AC is still working and air is coming out, but just very very little...its not on automatic. I dial up the speed and nothing basically happens for 1min - 20 min, then when it feels like it the speed comes back to whatever I dial it onto. Happens on a pretty much daily basis. I thought it was the blower motor, but since it does respond (in its own time) I'm thinking its something with the AC electrics. Its also recently started to get that stale water smell after I leave it for a couple hours. So, I'm having to run the blower without AC for 1-2min before shutdown to evaporate it. Anyone had similar problems, especially with the blower speed? Thanks

N

Norm

· #2 · Jul 4, 2005

I'm having exactly the same problems. Although, the last two weeks I have had the blower on either full all the time or off completely.
I have dismissed it as age.
I am not due at the dealers for service for another 3 months and I don't want to take it in just for that as it doesn't really annoy me that much.
Is there anybody else with this problem? or is there someone who has resolved this problem?
Maybe you could be kind enough to enlighten us. cherrsagai

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tranck

· #3 · Jul 4, 2005

Mine did the same thing and I forget what the fix was but the dealer took care of it at little cost.

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gsfent

· #4 · Jul 4, 2005

tranck said:
Mine did the same thing and I forget what the fix was but the dealer took care of it at little cost.

There is a fan blower resistor pack that controls fan speed. Located behind the glove box, repaired for me under warranty, it was about a 30 minute fix.
Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......

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M5_SMG

Discussion Starter · #5 · Jul 4, 2005

gsfent said:
There is a fan blower resistor pack that controls fan speed. Located behind the glove box, repaired for me under warranty, it was about a 30 minute fix.
Regards,
Jerry

You were having the same problems as described? Any idea what goes wrong with the resistor pack? Was it repaired or just swapped for a new one? If its a replacement job, I suppose theirs a new part number for the replacement item to stop it happening again? Thanks

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M5_SMG

Discussion Starter · #6 · Jul 4, 2005

Just made a quick search online with the info. gsfent gave, here's the fix:

http://www.540i6.com/finalstagereplacement.html

Thanks!

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Digi

· #7 · Jul 4, 2005

Your problems are definitely a bad final stage resistor. I don't know why BMW can't improve this part after continuous failure over the life of all BMWs since at least 2000. I know X5s have the same issue. Where are the quality control people at BMW? Surely it is not cheaper to keep replacing these under warranties.

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gsfent

· #8 · Jul 4, 2005

M5_SMG said:
Just made a quick search online with the info. gsfent gave, here's the fix:

http://www.540i6.com/finalstagereplacement.html

Thanks!

Good find!!
Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......

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