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Hissing/whistling noise at highway speed - HVAC?

Clocked92

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Clocked92 Enthusiast

Clocked92

Posted
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I was driving home tonight on the highway and in between songs on my iPod I could hear a kind of hissing/whistling noise. It sounded like it was coming from the dash and sounded like other HVAC type hissing I've heard before. I tried all the different settings on my HVAC system including fan completely off and it's still there.

 

It is not there at slow speeds, but gradually gets louder as I go faster. It was -19C on my drive home and I'm sure the windchill on the outside was -50. Could this have any affect?

Clocked92 Enthusiast

Clocked92

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I know it's not from the windows. Ill see if I can get a video of it with sound. Again I'm attributing lots of strange noises to the extreme cold.

  • 1 month later...
thecobra Enthusiast

thecobra

Posted
Posted

I know it's not from the windows. Ill see if I can get a video of it with sound. Again I'm attributing lots of strange noises to the extreme cold.

Did you get anywhere on this? I have heard a whistle now twice this week. Both times on cold days, both times recently after using 4wd. It really doesn't sound like it's coming from inside the cab to me. Today, it was around ~1300 RPM and 80-85km/h

matixkyle Enthusiast

matixkyle

Posted
Posted

Growing up on the prairies owning various makes and models I was told by a wise service tech to not worry about noises and creeks during the cold. Those prairie temps and winds do insane things to vehicles.

 

I would think that when it gets warmer if the sound is still there take it in.

EPIC CAJUN Enthusiast

EPIC CAJUN

Posted
Posted

When I was riding around with the service managers a few months back trying to get them to diagnose my ring gear humming noise, they both kept playing with the ac and heater controls(two separate test rides) Turning the fan on and off at different speeds. Opening and closing the dampners for the vents all the while listining I intently around the dash area. They were claiming that in the effort to seal the cab somewhere along the firewall area, the silicone sealer that is used by GM sometimes will form tiny pin holes in it allowing air to pass thru at hwy speeds. Thus causing a whistling noise.

 

Maybe not what you guys are hearing, but it triggered the conversation I had with them reading your post.

Clocked92 Enthusiast

Clocked92

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Posted

Did you get anywhere on this? I have heard a whistle now twice this week. Both times on cold days, both times recently after using 4wd. It really doesn't sound like it's coming from inside the cab to me. Today, it was around ~1300 RPM and 80-85km/h

 

I was never able to recreate the sound to figure it out more. Could be because I haven't driven it on the highway in that cold of weather since. But ya, it was after about 80km/h when I could really start to hear it.

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