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  #21  
Old 06-26-2012, 10:35 PM
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Yes, i had my freon checked. I even had it evacuated and refilled to no avail. 1lb low, my X only holds .97lbs? Also, I'm no expert but from what I have read it is sometimes normal for the variable displacement compresor to have a slight delay while excess liquidified gas and stuff is pumped out of the compresor but my delay is quite long and definitely not normal. Thanks though for the input.
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  #22  
Old 06-27-2012, 02:45 AM
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I tell ya Marine, I was at the shop to get the compressor replaced, moving the car to the lift when the darn AC went cold and I almost lost my nerve right there! :-P

I myself didnt do it until the delays got so long that it would hardly go cold anymore and there was nothing to lose anyway.

Let us know if and when you go though with it, we are the first people talking about solving this problem online that I know of, I know because when I was going through this there was hardly any info on the BMW forums.
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  #23  
Old 06-29-2012, 03:42 PM
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Just read through this thread and thought I share my a/c nightmare. So my a/c would have the same fooking delays explained here be OP and other posters. Sometimes the "delay" never came and I would go a whole day without a/c. Took the vehicle to a BMW dealership to get it diagnosed and after 2 hours of sitting in the waiting area, service adviser says my compressor is shot and its a $1600 repair bill with parts and labor. I ran from there with all four windows open. So now that I knew that it was the compressor because BMW said so, I purchased a reman'ed one and got it installed. To no avail, a/c still wouldn't work. Took the vehicle to a recommended shop in Jersey and after a diagnosed I was told that the climate control panel inside was not working. Got a used one and left the shop within an hour with freezing cold a/c. Drove the vehicle for 3 days with awesome a/c and on the fourth boom, a/c would not turn on again. I call the shop and explained that the shit went crazy again so I bring the vehicle back. It has been almost 2 weeks today and my vehicle is still in this shop. They have tried everything, even installing the old compressor that BMW said was shot (it wasn't). The owner of the shop has now taken my vehicle as a project because he says he has never seen anything like this. All components of the air condition system are working, and a/c works but after driving the vehicle for 20 minutes with a temperature gauge in the vents he notices that the temperature rises from 30 degrees to 70 and compressor stops. The compressor kicks back in after 10-20 minutes and this continues to happen. Finally today I call and hear the words/get the answer I was hoping to get... We have found the problem. There appears to be a short in the DME circuit that controls the a/c system. I need a new DME. Looking at a re-manufactured one now because a new one it out of the question.
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  #24  
Old 06-29-2012, 03:49 PM
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I confirm with my car that

Sometimes the "delay" never came and I would go a whole day without a/c
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  #25  
Old 06-30-2012, 06:06 AM
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Cisc0, that indeed sucks a big hairy meatball!

I would have done things differently in your situation though.

First thing I check when AC cuts out is refrigerant and compressor clutch operation.

In your case, with refrigerant in the system and the compressor cutting out it would definitely be pointing towards an electrical problem first, either with the compressor clutch itself, the AC computer and its related sensors, or DME.

It would still be a nightmare narrowing it down to which electrical system is shutting off the compressor though, and why.

In our case though the compressor clutch is always engaged, but no cooling.

That particular variable helps narrow own the possible causes in this particular AC system type.
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  #26  
Old 06-30-2012, 09:38 AM
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g300d,

You'd think the professionals @ the BMW dealership I went to would follow proper diagnosing techniques but they were just looking to rape me as thy usually do. Good thing is that it is finally sorted out and I get I return the compressor I purchased.
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  #27  
Old 08-25-2012, 10:59 AM
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This is my first post in an attempt to help those who have the AC delay problem like I did on my 06 X5 3.0; which I spent a couple of weeks before resolution. Bought used w/ 75k miles 8 months ago and always had my delay after the car was off for many hours (like overnight or after a 12 hour shift), the AC would blow ambient temp until I was down the road a couple of miles then instant cold AC.

The problem ultimately in my case occured when the hi and the low sides of the compresoor equalized, which takes many hours once the AC was off (this is norm). Even after a few hours when the pressures were not yet equalized the AC would immediately blow cold and stay cold even at idle. I verified this renting gauges from Autozone and was able to duplicate the problem by shutting off the AC (after it was working) and slowly bleeding the high to the low side until pressures were equalized. Then turning on the AC (comp engaged) the pressured stayed equalized (no cold) until either I reved the engine enough to cause a slight difference in pressure then the presssures would instantly move to norm high and low.

My take on it (not being a mech engineer) is that it is something in the comp similar to a hung open or closed suction or discharge valve, or it is something else not seating or resetting until there is enough difference in pressure to hold force on it to work. The discharge line of the comp stays ambient to the touch so no vapors are leaving the comp at this time.

Like most everyone, I thought it was the fan, pressure switches, freon level etc. I changed out the PCV on the comp itself and that did no good. I bought a remanufactured comp and installed myself and only changed the dessicant dryer media, prob solved. Guess you can say good news is that the comp did not lose pieces (no major damage) so the repair did not include the expansion valve and condensor and flushing as would be required for warranty usually when installing a new comp.

Just to note, when I received my remanned comp, I could hold my finger over the discharge, turn the comp by hand and pressure would build behind my finger. When I removed my problem (orig) comp it would not build pressure by a hand turn.

Not the answer some wanted but hope this helps.

Last edited by Geauxfast; 08-26-2012 at 08:00 PM.
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  #28  
Old 08-26-2012, 09:49 AM
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Hey Geauxfast, it looks like you had the same problem I did, the variable displacement control valve in the compressor. When this sticks open, there is no compression, and thus no cooling.
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  #29  
Old 08-26-2012, 07:55 PM
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Just to note I did change out the PCV that adjusts piston stroke to no avail. I am thinking it is the discharge or suction "check" valve if one exists or whatever it is that seals the vapor in to allow compression (that which is in all compressors). The PCV sends either high or low side to the piston/wobble plate crankcase side to vary piston stroke. I thought I later read that at worse the piston stroke would be reduced to 20% so I am thinking a sticking or failed PCV will not completely prevent compression only screw around with your pressures by mis-adjusting the piston stroke. My problem was consistent and never intermittent so I don't know if "sticking" would apply. I also early on shot oil in the system to unstick whatever might be sticking and no luck there either.
I may gut the comp and report any findings.
BTW thanks for the thread.
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  #30  
Old 10-31-2012, 02:03 AM
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Interesting theory, would be interested in whatever you find out.
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