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  #1  
Old 07-12-2021, 12:32 PM
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Strange AC/Bower issue on 2004

Good Morning


Strange issue on 2004 4.4. Let me set this up: Picked up E53, Drove it 400 miles across state. All was good, except part way home AC stopped blowing out of vents. Changing mode, which vents it was blowing out, did not change anything. Happened again yesterday on 75 mile trip, up to destination all worked fine, on the way home it did the same thing. You can still hear fan blowing and air moving, but no/very little air coming from any vents. Changing mode did nothing, except when hitting defrost, for a very brief moment we could feel air coming out vents. 10 minutes after getting home, drove it to my In Laws and all worked normal. Hmmm. Anyone else have a similar issue? Any ideas?



Just want to say a thanks also on this forum, Car had the Trifeca of lights and i was able to repair it (sent ABS module off) with info from here.


Scott
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Old 07-12-2021, 02:01 PM
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It's sounds like your evaporator is freezing up. There a lot of threads on this already. Turning the A/C off will let the ice thaw out and then using a fairly high fan speed and re-circ will help to keep it from happening.
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Old 07-12-2021, 02:15 PM
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+1
Frozen is the most likely reason.

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Old 07-12-2021, 02:51 PM
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Thanks all, that sounds like exactly what is happening.



Appreciate the help Not used to these German cars yet, way easier to work on my old muscle car.


Scott
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Old 07-12-2021, 03:33 PM
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it's a whole different ball game

Quote:
Originally Posted by ScottPhillips View Post
...Appreciate the help. Not used to these German cars yet, way easier to work on my old muscle car.Scott
Yep, you're right. Fifty years+ of working on simpler vehicles made it easy for me to go from one to another, since most systems were the same, simple. Then came the "electronics" to make everything better ?!?

And it was no longer possible for a "shadetree" mechanic (even with '71 GM technical school training) to fix everything, without advanced learning, a bevy of testing equipment, detailed information available, and very often the aid of a widespread network of other DIY-ers (and some factory techs thrown in), to work on a vehicle. I'm finding that my old (but new to me) '01 X5 is probably going to be my hardest challenge to work on, though I've worked on dozens of OBDI & OBD2 vehicles over the years.

Just trying to find an acceptably-sized switched wire underhood (wire gauge was too small on those I found, for adding an electric fan) was impossible, whereas it's never been a problem on any other cars/trucks so far. And, I'm fearful of tapping into any of the wires coming out of any module, just in case there's the possibility of backfeed into that module. BMW's sure have a lot of modules, even more than GM cars I've worked on.


So, Scott, I'll second your voicing of appreciation to this forum (and others) for any and all help shared to fix, modify, or even understand our modern vehicles, X5's being the newest one to learn about, for us. Yeah, I just traded my '66 Chevelle drag racer for this X5...I could (and have done so many times) tear it apart and rebuild without problems, due to having many years of experience with it. Simple.
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Old 07-12-2021, 04:42 PM
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Yeah, there are just a few (too many) modules on these things. I never would have got it if the price wasn't too good to pass up (free from Brother in law :-) )



I am building a restomod 68 Camaro, only 1 module for the LS ignition... way simpler.


Scott
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Old 07-12-2021, 08:45 PM
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I wasn't entirely old school

Quote:
Originally Posted by ScottPhillips View Post
...
I am building a restomod 68 Camaro, only 1 module for the LS ignition... way simpler.
Over the last years of racing the '66 Chevelle, I tried upping my game, moving up in classes (club-to-club racing, bracket racing). Capacitive ignitions (Mallory first, then MSD 6AL later), two-steps, rev limiters, line locks, transbrakes (with long-throw mechanical delay switches), shift lights, two-stage nitrous kit (for a short time when still using a 327, before going to big block power), and other assorted devices were used. I quit racing just as I was ready to go with a delay box, which is another "module" to mess with.

But, if anything went amiss, I usually had a back-up for everything (I carried-along enough parts & supplies to every race, that other racers from opposing clubs would get spares from me); but nobody could ever carry enough spares for a modern BMW, nor could they diagnose and fix the problem between stages, I bet. Ha,ha,ha!
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Old 07-15-2021, 11:55 AM
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LOL, the old KISS principle was a good thing. The electronics do lots a neat stuff, but....


66 Chevelle is one of my Favorites. My brother has a 64SS.


Scott
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