Buzzing noise under hood
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    1. #1

      Buzzing noise under hood

      Hey guys. After driving my car this morning, I heard a buzzing noise, apparently coming from under the hood, on the driver's side of the car. It stopped after a minute or so, and then happened again. I looked under the hood, and it appears to be coming from the pump in front of the battery (or in that area). I'm not sure if it was because of the cold weather, or something else. Does anyone know what this is, if it's normal, and if it's something I need to do anything about? Thanks in advance.

    2. #2

      Re: Buzzing noise under hood (AS40)

      Quote, originally posted by AS40 »
      Hey guys. After driving my car this morning, I heard a buzzing noise, apparently coming from under the hood, on the driver's side of the car. It stopped after a minute or so, and then happened again. I looked under the hood, and it appears to be coming from the pump in front of the battery (or in that area). I'm not sure if it was because of the cold weather, or something else. Does anyone know what this is, if it's normal, and if it's something I need to do anything about? Thanks in advance.

      Buzzing noise from under the hood of the 2.4?

      Must be the engine.....

      Sorry couldn't resist.


    3. #3
      Junior Member davidklaw's Avatar
      Join Date
      Aug 2004
      Location
      Canton, MI
      Posts
      400
      I've got the same noise. I don't believe it's an issue but it surely is annoying.
      2004.5 S40 T5
      18" HEICO Volution X's and HEICO black matte grille
      EuroSport exhaust

    4. #4

      Re: (davidklaw)

      Might you guys be talking about the electrohydraulic power steering pump winding down?

    5. #5

      Re: (RANGO)

      That sounds about right. I looked under the hood, and there's a pump right in front of the battery, that seemed like it was making the noise.

    6. #6
      Moderator tmtalpey's Avatar
      Join Date
      Jun 2004
      Location
      Eastern MA
      Posts
      6,594

      Re: Buzzing noise under hood (AS40)

      That's the fuel system evaporative purge pump. It pulls recaptured fuel (vapors, overfills, etc) out of a reservoir and puts it back into circulation.

      This usually happens when driving, but can happen at other times. Completely normal.

      Tom.

      2005 V50 T5 AWD 6MT w/Heico tune, Heico exhaust, Bell intercooler, IPD TCV, Viva CBV, Elevate rear swaybar, Snabb shift kit, etc.
      2004 XC90 2.5T AWD
      1956 PV444 complete, running
      1956 PV444 very original, very rough