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#1
05-27-2007, 07:04 PM
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01' X5 4.4i problems
let me start off by saying that I love this site, BMW's rock. I have been having a problem with my ac recently, and now that the summer has started it could not have picked a better time to. First: when I turn the ac on my X, at first I hear a slow hiss coming from the vents and as I turn up the speed the hiss becomes louder. now is this because I need to recharge my ac or am I having another problem. I really do not want to take to the stealer if i dont have to so I am trying to find a solution to this problem. anyone? 
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#2
05-27-2007, 09:21 PM
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Does the "hiss" start and stop as the a/c compressor cycles?
If so there is a good chance your X is low on freon.
__________________
2003 X5 4.4 2006 Porsche 997 cabriolet 2003 Ducati St4s 2002 Ducati 748 1976 BMW R90s
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#3
05-28-2007, 03:36 AM
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very typical a/c problem is the final stage resistor, which (supposedly) keeps feeding electrical power to the a/c fan even when turned off - a search here of "a/c problems" or the DIY area may pop up some threads that will help you solve your problem
__________________
Mark         _______________________________2001 X5 4.4i topaz blue/sand Sport, complete Dinan S2  , hitch, V1, tint, BSW Stage 1, Alpine INA-W910BT___________ Life is not fair! You can't protect people from their own stupidity! Laughter makes life worth living
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#4
05-28-2007, 09:38 AM
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A typical behavior of a failing final stage resistor is when the fan starts working erratically like suddenly stop blowing or start blowing at max for no reason. A hiss sound could be related to low freon.
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#5
05-28-2007, 06:32 PM
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Birdman, yes the hiss starts and stops when the car cycles, but it's more predominant when the ac is started. Flyboy, I noticed that the outside fan in front of the radiator does not come on when I turn the ac on or turn it off. I do not know if this has something to do with the problem. I recently came from walmart and purchased my own recharge kit, do I just plug and play has anyone come accross any problems doing this and is there a meter to know if you are low in freon. Thanks guys this is why I love this place.
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#6
05-28-2007, 08:16 PM
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Quote:
The electric fan in front of the radiator should run with the a/c. Get this fixed as fast as you can. I didn't realize my 528's electric fan was not working, lost freon due to the subsequent high pressure in the freon circuit and lunched the compressor $$$$. Freon contains lubricating oil for the compressor.
__________________
2003 X5 4.4 2006 Porsche 997 cabriolet 2003 Ducati St4s 2002 Ducati 748 1976 BMW R90s
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#7
05-28-2007, 10:23 PM
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yeah sounds like it to me too. does anyone happen to know which side is the low and which is the high on the ac lines. I have one near the radiator and one further back. I also have to replace the service ports of both lines to conform to the R-134a is this an easy job? I have two ports that came with the kits I bought. has anyone ran into any problems changing these?
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