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  #21  
Old 05-11-2017, 10:26 PM
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Remove the hvac control unit from the dash, take it apart to where you can clean the junk stuck on the temp sensing wire, you'll know it when you see it. Just like the element in a MAF, these can get nasty. See if that helps. Clean the dust off the little fan too while your in there.
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  #22  
Old 05-16-2017, 12:15 PM
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Quote:
Originally Posted by Plattus1000 View Post
Remove the hvac control unit from the dash, take it apart to where you can clean the junk stuck on the temp sensing wire, you'll know it when you see it. Just like the element in a MAF, these can get nasty. See if that helps. Clean the dust off the little fan too while your in there.
So I removed the unit and sensor wasn't dirty all and actually looked like new, however it was out of the hole where it is supposed to be located and just kinda hanging behind the hvac controller. I put it back in and it did not make a difference. I had seen a utube video where a guy was experiencing a similar problem on his bmw and he revved the engine to about 4k rpm and it started cooling. He never said what the fix was however. I decided to do the same and it instantly started to cool. Any Ideas?? Thanks
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  #23  
Old 05-19-2017, 06:05 PM
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I'm having the same issue, aux fan will not engage when the AC is on. I'll have to try that trick disconnecting the pressure switch to test the fan

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  #24  
Old 05-19-2017, 10:01 PM
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Originally Posted by Beamernewbie View Post
So I removed the unit and sensor wasn't dirty all and actually looked like new, however it was out of the hole where it is supposed to be located and just kinda hanging behind the hvac controller. I put it back in and it did not make a difference. I had seen a utube video where a guy was experiencing a similar problem on his bmw and he revved the engine to about 4k rpm and it started cooling. He never said what the fix was however. I decided to do the same and it instantly started to cool. Any Ideas?? Thanks
Sorry, didn't read the rest of the thread. Could the clutch on the compressor be failing? If the revving influenced it, maybe it's not engaging correctly?
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  #25  
Old 05-22-2017, 09:32 AM
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Clutch appears to be working properly. The engine rev apparently doesn't work every time either. Sometimes you can turn it on after driving it awhile and it cools immediately and then other times it doesn't, but it never cools immediately after it's been parked for a few hours. This is very frustrating.
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  #26  
Old 05-22-2017, 11:02 AM
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Originally Posted by Beamernewbie View Post
Clutch appears to be working properly. The engine rev apparently doesn't work every time either. Sometimes you can turn it on after driving it awhile and it cools immediately and then other times it doesn't, but it never cools immediately after it's been parked for a few hours. This is very frustrating.
So clutch is working and compressor is turning when it's not cooling ? Maybe the variable displacement valve is sticking. I think you are going to need someone to check this for you.
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  #27  
Old 05-25-2017, 04:45 PM
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So now the AC doesn't cool at all!!!! My wife came home yesterday sweating worse than a hooker in church on Sunday morning. The aux fan is working however I don't know if it all the time. The compressor clutch is engaging, at least when I look at it. Soooooooooo any ideas at this point? I really don't want to go to a BMW dealer because it seems like nobody ever leaves there without a 2k less in their bank account than when they arrived.
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  #28  
Old 05-25-2017, 08:36 PM
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I'm in the same situation as you now and came to this thread looking for answers.
2006 X5 3.0. AC has worked off and on since last summer.
I hooked up a pressure gauge to the low side, it showed 190psi. Not good. I pulled the plug and the aux fan kicked on high. Put it back, back to off sometimes cycling on.
Looked at the front of the AC unit, clutch is spinning when engaged, at least the entire pulley is, not just a portion of it. Sometimes it kicks on sometimes it doesn't. I drove to the store to get some r134a, drove back home and it was on. Checked pressure again, 30psi. Good. Used my gauge filler to purge it down to 10psi, filled it back up with the can to 35psi. Blew icy cold.
Drove it again after it sat for a few hours, won't kick on, it's warm air blowing again.
I
Over the winter I have replaced the panel with new buttons and cleaned the temp sensor, so that's not the issue.
Now I had this same issue on my 1998 F150. The fix was to pull the pulley off, pull the front off the AC unit, and pull a shim from the shaft and put it back on. It worked beautifully after that. Is this an option with a BMW AC unit? Has anyone tried this? It seems like the exact same issue where thr clutch will only engage sometimes due to the tolerance and the magnets not picking up all the time.
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  #29  
Old 05-26-2017, 01:58 AM
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Quote:
Originally Posted by Beamernewbie View Post
So now the AC doesn't cool at all!!!! My wife came home yesterday sweating worse than a hooker in church on Sunday morning. The aux fan is working however I don't know if it all the time. The compressor clutch is engaging, at least when I look at it. Soooooooooo any ideas at this point? I really don't want to go to a BMW dealer because it seems like nobody ever leaves there without a 2k less in their bank account than when they arrived.
^I just replaced a compressor in my mom's FX35 Infiniti for exactly the symptoms you are describing. It used to cool intermittently and continued to get worse and worse until finally no cooling at all. Low side was reading too high and high side was reading too low. Not sure what in the compressor failed... but it cools great now after replacement (along with Xpansion valve and receiver dryer).

How any miles are on your X? Original compressor?
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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)


2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)
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  #30  
Old 05-26-2017, 06:43 AM
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