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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-02-2012, 04:06 AM
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diggyd357 diggyd357 is offline
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Location: Louisiana
 
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Mein Auto: 97 528I
Must rev car for ac compressor to cut on

97 528I
217K
New purchase (3mnth)
Reconstructed tittle
not sure on history
...but it runs grreat & got a swweeeat deal !!!!

My ac works...blows cold. All the controls work...only you have to rev the car up to about.2500 rpms or better then when the rpms fall the compressor kicks on and it stays on for the full trip. The compressr is also REALLY noisy. I tried adding just a touch of pag oil with no change good or bad. I know the car is old and the compressor looks old too, but the age or condition of the compressor , I wouldn't think, would be the issue. Unless maybe it's requiring a surge to get it going....kinda like putting a hard-start capacitor on your ac condenser at home maybe ??? Anyone had this problem or have any ideas ???
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  #2  
Old 10-02-2012, 05:57 AM
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DHoang DHoang is offline
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Location: Austin, Texas
 
Join Date: Dec 2008
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Mein Auto: '98 528i, '82 323i
might be a bad pressure switch
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Old 10-02-2012, 06:45 AM
AH673000 AH673000 is offline
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Mein Auto: 1997 BMW 528i
My son and I both own '97 528s .... 120k and 180k ..... Both a/c systems noisy , both work well . Neither of us have evacuated the system and recharged with the exact weight of freon as recommended on this forum . We will do that now that winter is on the way .
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Old 10-02-2012, 06:49 AM
cn90 cn90 is offline
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Mein Auto: 1998 528i 5-sp 140K+
At 217K, the AC Compressor has lived its life. The bearing on the pulley and the bearing inside the compressor is probably done.

A new compressor is not that expensive, search for DENSO brand.
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  #5  
Old 10-02-2012, 09:09 AM
poolman poolman is offline
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Mein Auto: 525i station wagon
If it's making noise , it's on it's last legs. Along with the noise, that is an indication that it's falling apart and introducing contaminates to the AC system. When that happens, you don't just replace the compressor--you replace the condinser and the compressor along with new refrigerant.
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Old 10-02-2012, 09:28 AM
AH673000 AH673000 is offline
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Mein Auto: 1997 BMW 528i
Curious , what is falling apart ? A/C has been noisy for 20k miles when it is first engaged . Not a bearing , but like low on freon . Checked pressure using normal methods but results are non conclusive. Pressure bounces around . Did add freon but no change . Will evacuate and refill with exact freon quantity called for . I will post results .
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  #7  
Old 10-05-2012, 05:29 PM
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540iman 540iman is offline
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Location: N.W. Indiana
 
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Mein Auto: 2002 540i sport
very good chance it is just low on freon and is not making the low pressure cut-off when idling. Rev and the pressure increases enough to engage compressor. Try about a half can of freon. (6oz or so)
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  #8  
Old 10-05-2012, 07:50 PM
helpmyfive helpmyfive is offline
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Mein Auto: 528i
I thought I read there is a temperature threshold for the condenser. If the secondary cooling fan doesn't work the temperature may be too high to let it operate. My car does the same thing. I just suffer. Once in a while it will stay functioning at idle.
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