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Discussion Starter · #1 ·
After driving around today with the temp reading at 99, I decide to park and leave the car running for about 3 mins. I get out of the car and I hear what seems to sound, as best as I can describe it, like an air leak in a tire. Checked all the tires, and they were fine. Traced it to the engine bay. I have never heard this noise before and I checked the fan and it was off. I tried to trace the sound, but my face was burning off from all the heat in the engine bay. I took a video, but I can't even use that to trace it. But you can still hear the sound. Any idea what it could be? (please excuse the phone video)<p><A HREF="http://s674.photobucket.com/albums/vv110/oxidizer2k/?action=view&current=0427091500.flv" TARGET="_blank"><IMG SRC="http://i674.photobucket.com/albums/vv110/oxidizer2k/th_0427091500.jpg" BORDER="0"></A>
 

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Re: noise while engine is off. (o2k)

Was it the interior climate fan that you heard? There is a function called "afterblow" which runs the climate system fan for a few minutes to dry out the evaporator to prevent moisture causing odor. It sounds like a loud whisper from outside the car. Inside you can feel air blowing out of the dash vents. That's the only thing that jumps to mind.
 

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Re: noise while engine is off. (cdauerer)

Loud Whisper? Last time I walked up to my car and heard the fan I thought someone started my car.
 

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Re: noise while engine is off. (cdauerer)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>cdauerer</b> »</i></TD></TR><TR><TD CLASS="quote">Was it the interior climate fan that you heard? There is a function called "afterblow" which runs the climate system fan for a few minutes to dry out the evaporator to prevent moisture causing odor. It sounds like a loud whisper from outside the car. Inside you can feel air blowing out of the dash vents. That's the only thing that jumps to mind.</TD></TR></TABLE><p>Afterblow doesn't activate until at least 1/2 hour after the car is shut off. <p>it is most likely the ECM cooling fan.
 

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Re: noise while engine is off. (Needsdecaf)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Afterblow doesn't activate until at least 1/2 hour after the car is shut off. <p>it is most likely the ECM cooling fan. </TD></TR></TABLE><p>The ECM has a cooling fan? Did not know that. Well, it was coming from that area.
 

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Re: noise while engine is off. (mjaffe)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mjaffe</b> »</i></TD></TR><TR><TD CLASS="quote">Loud Whisper? Last time I walked up to my car and heard the fan I thought someone started my car.</TD></TR></TABLE><p>Yeah, I've had that happen. Usually it's very soft. But since the weather has gotten so hot, the fan has been very loud.
 

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Re: noise while engine is off. (o2k)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>o2k</b> »</i></TD></TR><TR><TD CLASS="quote"> I have never heard this noise before and I checked the fan and it was off. <p><A HREF="http://s674.photobucket.com/albums/vv110/oxidizer2k/?action=view&current=0427091500.flv" TARGET="_blank"><IMG SRC="http://i674.photobucket.com/albums/vv110/oxidizer2k/th_0427091500.jpg" BORDER="0"></A></TD></TR></TABLE><p>It is hard to imagine that the engine cooling fan was not operating, since the car is stopped, and at an idle, it is 99 degrees ambient, and I assume at that temperature, the A/C is on. <p>Could be the vacuum pump located under the air box. If the ECU fan, you should hear it run for a few seconds after engine shutdown.<p>Afterblow, if it really is enabled, begins 50 minutes after engine shut down, and runs for 7 minutes.
 

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Re: noise while engine is off. (rogersampson)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>rogersampson</b> »</i></TD></TR><TR><TD CLASS="quote"><p>It is hard to imagine that the engine cooling fan was not operating, since the car is stopped, and at an idle, it is 99 degrees ambient, and I assume at that temperature, the A/C is on. <p>Could be the vacuum pump located under the air box. If the ECU fan, you should hear it run for a few seconds after engine shutdown.<p>Afterblow, if it really is enabled, begins 50 minutes after engine shut down, and runs for 7 minutes. </TD></TR></TABLE><p>Doh, I mis read the initial post. I thought he had shut the car off. <p>Not the ECU fan, then. You only hear that when the car is off.
 

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Re: noise while engine is off. (Needsdecaf)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Needsdecaf</b> »</i></TD></TR><TR><TD CLASS="quote"><p>Doh, I mis read the initial post. I thought he had shut the car off. <p>Not the ECU fan, then. You only hear that when the car is off. </TD></TR></TABLE><p>The car was off. Not idle. I had it idling for 3 mins to cool down the turbos. Then I shut off the car. When I got out, that was when I heard the noise.
 
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