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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 01-15-2017, 09:23 PM
Rik-72 Rik-72 is offline
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2002 525i - new owner with questions

I just purchased my first BMW . It's a 2002 525i , it needs a lot of tlc and attention . I was finally able to find a repair manual , but it will take some time to get here . In the bumper on the passengers side above the fog lamps is a device . i think it might be a compressor for air leveling , there are no hoses coming of it , but it blows air out of the top when I first start the car in the morning for about 5 minutes . Does anyone know what this devise is ? I would really appreciate some knowledge .
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  #2  
Old 01-15-2017, 10:12 PM
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tim330i tim330i is offline
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Welcome to Bimmerfest! I don't believe the E39 5 series has air leveling suspension. Can you post a pic?
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  #3  
Old 01-16-2017, 05:04 AM
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QSilver7 QSilver7 is offline
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Quote:
... In the bumper on the passengers side above the fog lamps is a device . i think it might be a compressor for air leveling , there are no hoses coming of it , but it blows air out of the top when I first start the car in the morning for about 5 minutes. ...
That would be your secondary air pump (SAP)...it's not for your suspension. The SAP's function is to pump cold air into the the catalytic converters in order to bring them up to operating temperature quicker. That's why you only hear it for a few minutes after a cold startup.

It is talked about a lot...so a simple google search for "BMW e39 SAP" should give you info to learn about this component, its issues, and how to correct any issues it may be having.

Good luck.
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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
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99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

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Last edited by QSilver7; 01-16-2017 at 05:15 AM.
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Old 01-16-2017, 06:32 AM
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TheHockeytowner TheHockeytowner is offline
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Quote:
Originally Posted by QSilver7 View Post
That would be your secondary air pump (SAP)...it's not for your suspension. The SAP's function is to pump cold air into the the catalytic converters in order to bring them up to operating temperature quicker. That's why you only hear it for a few minutes after a cold startup.
+1, Qsilver is on the money as always. Is there something wrong with your SAP? If you need to replace it, AutohausAZ has the OEM Pierburg part for about the cheapest you can find it.
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Old 01-16-2017, 10:47 AM
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TheAngryBear TheAngryBear is online now
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I don't think the is anything wrong with the pump based on the description:
Quote:
Originally Posted by Rik-72 View Post
there are no hoses coming of it , but it blows air out of the top when I first start the car in the morning for about 5 minutes
It is blowing air...
I think OP is missing the pipe connecting the pump to the exhaust/cats...
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