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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 10-11-2014, 10:14 AM
Djrichyrich Djrichyrich is offline
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Location: Colorado
 
Join Date: Jul 2014
Posts: 1
Mein Auto: 1997 540I
idenitification: Engine humming under brake fluid reservoir

I have been hearing humming coming from the engine lately and I may have been able to identify the parts that have been causing it. I attached pictures of these parts.

I usually hear it as soon as i turn the key to the on position, the noise comes and goes as I drive but for the most part it is heard on the start up.
Would you guys help me figure what these two parts are?
has anyone else had this experience, is the buzzing bad?
Also would I need to replace them?

thanks for help.(sorry for the pictures BTW. all i had was a potato)
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Last edited by Djrichyrich; 10-11-2014 at 10:23 AM.
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  #2  
Old 10-11-2014, 02:22 PM
edjack edjack is offline
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 9,410
Mein Auto: '97 540i 6 speed
Turn off the HVAC: Hold the blower speed toggle until all the LEDs are off. It might be the heater control valve, the pic of which you've captured.
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