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  #71  
Old 06-20-2010, 05:37 AM
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i would be concerned with the functioning of the compressor if the differences are drastic.
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  #72  
Old 06-20-2010, 10:48 AM
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Down here in the dealer shop I have seen the effects of just the AUX fan not working... Head pressure shooting up to 400+ psi and all cooling capacity lost. Throw a new fan in there and pressures go normal and cooling perfectly.

And just about every time I get a vehicle in that blows cool on the left and warm on the right it is a low refrigerant charge. Getting it to the proper charge level does get it blowing cold as it should be, but is only step one of the diagnosis... Step two is figuring out where you lost the refrigerant. Looking for leaks isn't as easy as it seems, and not all techs are good at it.
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  #73  
Old 06-21-2010, 02:57 AM
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Quote:
Originally Posted by Weasel View Post
... Head pressure shooting up to 400+ psi and all cooling capacity lost.
how is this so?
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  #74  
Old 06-21-2010, 08:12 AM
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The AC system is designed with this fan in mind to cool the condensor. When that fan is no longer in the equasion the condensor cooling becomes extremely inefficient and the condensor temperature rises substantially causing higher pressures, which casue higher temps, which cause higher pressures etc. It climbs up pretty damn high and pretty effectively kills the cooling potential of the evaporator by raising the pressure and temperature of the evaporator as well.

Keep in mind that AUX fan is mounted directly to the condensor while the main engine fan is not only smaller, but has a viscous coupling so doesn't move as much air, and the air it moves has many cooling fins to pass through and many air spaces to pull air from besides the condensor.
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  #75  
Old 06-21-2010, 09:36 AM
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thanks. the thermal runaway is understandable if there is insufficient cooling for the condenser. however, the engine fan seems much more powerful to me in sucking air thru the condenser than what the pusher fan could do. nevertheless, the engine fan alone may not be sufficient to cool the condenser for the ac to cool well esp if the car is stationary plus ambient temp is hot. i wonder why some other makes does not need a pusher fan (more efficient design for heat exchange?) and how one e53 owner could live with his pusher fan removed.
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  #76  
Old 06-21-2010, 05:16 PM
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The system was designed with this pucher fan in mind, and the whole system takes less than one lb of refrigerant anyways so it is more suceptible to these changes in temperature and pressure than bigger systems with 2-3 times the refrigerant capacity.
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  #77  
Old 06-23-2010, 10:59 AM
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this seems to be the case, ie the ac cooling capacity of the e53 is not exactly superb. i noticed that my e53 ac works ok up to an ambient temp of 113 but really struggles when ambient temp hits 122 which happened just 2 days back. at 122, the ac was completely unable to cool when the X is stationary.
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  #78  
Old 06-23-2010, 05:06 PM
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Well, that is a higher temp than most of the world reaches... and who really expects the engineers in Germany to think of the rest of the world?

Just be glad you don't live in an excessively cold climate where the crankcase venting system freezes and blows out the gaskets pushing all your oil on the streets...
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  #79  
Old 06-24-2010, 03:01 AM
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Wow, such an informative thread I too have fallen victim to a dodgy A/C, with cool temps on the drivers side and warmer temps towards the passenger- from what i have read, would i be correct to say that the things to be checked would be:

- aux fan
- freon levels
- refrigerant charge

should checking these 3 things yield positive results? (its starting to get REAL HOT in the NY area haha)
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  #80  
Old 06-24-2010, 11:13 AM
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Quote:
Originally Posted by JumpmanJunkie View Post
Would i be correct to say that the things to be checked would be:

- aux fan
- freon levels
- refrigerant charge
Check if the aux fan is spinning. Refrigerant check is next. Freon (R-12) is the word some people use for the refrigerant but its use was phased out in cars in the early 90s. The refrigerant used in X5s is R-134a.

According to Wikipedia, R-134a will no longer be used in new cars in Europe starting in 2011:

1,1,1,2-Tetrafluoroethane - Wikipedia, the free encyclopedia
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