X3 A/c not working

peter7156 · 09-27-2022, 08:52 AM

The ac/heater control panel dims after 1 second of turning the ignition on. The radio/cd controls do not work, but do work from the steering column.
I have checked all the related fuses and they seem ok. I have removed the radio/cd unit and checked the wires are secure. Any ideas what i could try?The a/c blows hot air only.

richardodn · 09-29-2022, 01:13 PM

I'd suggest scanning the IHKA (HVAC) system for issues with a BMW specific code reader. But for a wild guess, check/replace the blower final stage resistor. It tends to make weird things happen when it fails.

peter7156 · 10-07-2022, 11:07 AM

After being at the mechanics twice for this I decided to have a look myself. After checking all the related fuses and the wiring to the back of the control panel I checked the laser wire into the amplifier in the luggage area. On inspection it wasn’t glowing as it should, I blew on it reconnected and guess what everything now works fine. Just in case anyone has a similar problem!!

09-27-2022, 08:52 AM	#1
peter7156 Registered 2 Rep 3 Posts Drives: BMW X3 Join Date: Sep 2022 Location: london iTrader: (0)	X3 A/c not working The ac/heater control panel dims after 1 second of turning the ignition on. The radio/cd controls do not work, but do work from the steering column. I have checked all the related fuses and they seem ok. I have removed the radio/cd unit and checked the wires are secure. Any ideas what i could try?The a/c blows hot air only.
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09-29-2022, 01:13 PM	#2
richardodn First Lieutenant 160 Rep 350 Posts Drives: '12 X3 35iX/'20 440ix cabrio Join Date: Dec 2018 Location: Denver, CO iTrader: (0)	I'd suggest scanning the IHKA (HVAC) system for issues with a BMW specific code reader. But for a wild guess, check/replace the blower final stage resistor. It tends to make weird things happen when it fails. __________________ 1986 Delphin 528e - Roof rack equipped lumber hauler. 2008 Platinum-Beige X3 3.0si - Current project 2012 Alpine White X3 xDrive35i - My new snowmobile. 2020 Estoril Blue 440i xDrive cabrio w/MPPSK - This car is a blast to drive.
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10-07-2022, 11:07 AM	#3
peter7156 Registered 2 Rep 3 Posts Drives: BMW X3 Join Date: Sep 2022 Location: london iTrader: (0)	Fixed it myself After being at the mechanics twice for this I decided to have a look myself. After checking all the related fuses and the wiring to the back of the control panel I checked the laser wire into the amplifier in the luggage area. On inspection it wasn’t glowing as it should, I blew on it reconnected and guess what everything now works fine. Just in case anyone has a similar problem!!
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