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  #1  
Old 06-21-2009, 06:05 PM
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Major A/C Climate control problem? easy fix!

2002 BMW X5 3.0

Let me give you some background on what problems I had:

First off, I was experiencing erradic blowing out of the A/C vents. This was solved by a DIY post for Blower Motor Resistor aka Final Stage Unit repair I found here at X5world. Online parts supplier have this part as Blower Motor Resistor and I paid $64 at importecwarehouse.com fwiw.

Second and most concerning problem was that I also had complete climate control failure and was constantly blowing the fuse 48. I would change the Fuse and the climate control would come on for about 5 - 10 minutes before blowing the fuse killing the power before as well as after the blower motor resistor repair. You are not going to believe how easy this fix was for me personally. I read the horror stories on the net about having to replace the climate control unit for $1000 - $2000. I also read how the dealer would charge for diagnositics before the actual repair and then if there was still a problem there would be additional charges added to that.

Ok here is my fix that solved my problem entirely...........

I got my air compressor attached a needle head for blowing up footballs etc... and blew out both temperator sensor grates on the climate control on the dash and then installed a new fuse in 48 slot and the problem is solved! I figure this easy fix saved me at least $2000 since the dealer would have replaced everything they could. It appears that something had gotten into the sensor and was shorting out the climate control and a good blasting or air dislodged it and completely fixed it. I really hope this helps someone else from having to replace a climate control that is shorting out! :2thu mbs:
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  #2  
Old 06-21-2009, 07:01 PM
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I think I'm gonna try this if this problem comes up in the shop this summer... I'm sure any customer would be pleasantly surprised with that info.

I've had to narrow the fuse blowing amperage down to the climate control module before, but have no way to know the exact circuit that is causing the internal failure.
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Old 01-30-2011, 08:34 PM
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I tried this, my fuse 48 blew as well. The first time it didn't work, so I pulled the control unit out and blew the air from the rear of the unit and so far so good. Seemed the little fan was completely clogged. Anyway, the fuse hasn't blown after an hour driving time.
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Old 01-31-2011, 05:43 AM
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On other BMWs I've had, the sensor is always clogged up with dust. Normally it just makes the climate control slow to react so the temp in the cabin drifts up and down more than it should. Interesting that the E53 unit will throw a complete wobbly over it.
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Old 01-31-2011, 08:46 AM
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All,

not that I have that problem - but you never know what the future brings :-)
Would anybody be so kind and post a picture of where to blow with that needle?

Thank you

Helmuth
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Old 01-31-2011, 08:50 AM
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You can see the fluff in there.
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Old 01-31-2011, 12:01 PM
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Thank you a lot. I expected a much more complicated thing to be honest :-)
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Old 02-13-2011, 10:00 AM
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guess my fix was temporary. the fuse lasted about a week, using the A/C periodically. Then, yesterday, after using it most of the day, fuse 48 blew again taking out the entire climate control panel. Time for a closer inspection. I have read, that some E39 panels are compatible with our E53, Does anyone know this for fact? They physically look the same, even the angle of the panel edges. I guess the circuitry is in question
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Old 02-13-2011, 12:57 PM
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Quote:
Originally Posted by smoothhd View Post
guess my fix was temporary. the fuse lasted about a week, using the A/C periodically. Then, yesterday, after using it most of the day, fuse 48 blew again taking out the entire climate control panel. Time for a closer inspection. I have read, that some E39 panels are compatible with our E53, Does anyone know this for fact? They physically look the same, even the angle of the panel edges. I guess the circuitry is in question
Too bad about your fix. There's a high degree of similarity in that generation of vehicles (e38, e39, e53) especially the electronics. I wouldn't doubt they're the same units but you can also check on realoem to confirm that.
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Old 06-01-2011, 11:50 AM
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Hi Everyone,

I'm having similar problems with my climate control module, but it would only blow fuse# 48 when I have the a/c on and driving over 100km.

In my search I found the following TSB;

TSB: SI B 64 08 06
Fuse #48 IHKA
Released 31 May 2006

The fuse could be blowing due to a cut or chaffed wiring harness; shorting #48. Inspect the wiring beside the driver's knee area between the instrument panel and IHKA housing. Also, inspect the harness around the glove box (sharp edges), the water control valve, aux. water pump and between the fuse box and IHKA module. Make sure the connector isn't loose; leading to high resistance.

I had my water pump replaced at the dealer in February and I haven't needed to use the a/c until this week. So I have a feeling the problem lies in the harness around the water pump.

Thanks and good luck
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