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Old 07-21-2014, 11:15 PM   #1
Aramis76
 
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Soft whirring sound under hood when engine off

Hi guys!

I just noticed today that on occasion, I hear a faint whirring coming from under the hood. It lasts for maybe 10-20 seconds and then it's gone.

It may also coincide with unlocking the doors but not always.

I had just parked the car in the garage, but this was not the standard "ticking" of a car cooling down. This sounded electronic/electric.

Any idea?
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Old 07-21-2014, 11:18 PM   #2
mlee
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It's probably just cooling fans on your radiator.
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Old 07-21-2014, 11:32 PM   #3
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It seemed to come more towards the back of the engine/driver side than the front. Besides, why would the cooling fan spin if the engine is off?
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Old 07-21-2014, 11:36 PM   #4
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Originally Posted by Aramis76 View Post
It seemed to come more towards the back of the engine/driver side than the front. Besides, why would the cooling fan spin if the engine is off?
Not quite as common where you are from but when your coolant is still at a certain temp the fans will remain on until it cools down. May be an A/C fan motor or something if it's toward the back of the engine, but that would not stay on, just spin down.
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Old 07-21-2014, 11:48 PM   #5
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Originally Posted by Aramis76 View Post
Hi guys!

I just noticed today that on occasion, I hear a faint whirring coming from under the hood. It lasts for maybe 10-20 seconds and then it's gone.

It may also coincide with unlocking the doors but not always.

I had just parked the car in the garage, but this was not the standard "ticking" of a car cooling down. This sounded electronic/electric.

Any idea?
I hear it also. Very soft hum that runs for A few seconds. I have assumed it is a pump maintaining pressure somewhere - brakes, fuel.
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Old 07-22-2014, 08:51 AM   #6
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Originally Posted by wakespeak View Post
I hear it also. Very soft hum that runs for A few seconds. I have assumed it is a pump maintaining pressure somewhere - brakes, fuel.
I have wondered what the noise could be. I hear it too. The Dodge Caravan I drive for work has a very similar sound.
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Old 07-22-2014, 07:20 PM   #7
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I would love to know what this is too.
you don't even have to start the car, just turn key to acc. then back to off, and take key out. wait a few minutes and you hear that whirrrrrrrrrrrrrrrrrrr. maybe a servo motor or something for the ac vents
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Old 07-22-2014, 10:39 PM   #8
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I'd guess that it may be the evaporative emission system going through a test cycle. Just a hunch though. Ours does the same thing.
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Old 07-23-2014, 07:52 AM   #9
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You've got a small (1/2") hole through your firewall right in that area. Not sure if this information will help you to figure it out, but it might explain why a sound seems to be coming from that area when it might not be.


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Old 07-23-2014, 09:51 AM   #10
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This also happens when you put your key in the ignition before starting. Systems startup would be my guess. Which systems, not sure. Fuel? As stated before, emissions? Electrical?
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Old 08-15-2014, 01:35 PM   #11
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Originally Posted by GVA 45TH 2SS View Post
I would love to know what this is too.
you don't even have to start the car, just turn key to acc. then back to off, and take key out. wait a few minutes and you hear that whirrrrrrrrrrrrrrrrrrr. maybe a servo motor or something for the ac vents
Slightly older post, but to answer what that is... GVA nailed it, it is the servo that sets the position of the HVAC mode doors, seems to be on the Camaros it likes to be in defrost mode when the car is shut off. If you set it to defrost before turning off the car, it won't make this noise. Another test would be to not start the car, turn the key to on, and play with the mode buttons/recirc, and be able to duplicate the noise. Most of the GM vehicles in the last 5-7 years that I've owned make that same noise in varying degrees of volume when changing modes, the Camaro seems to be one of the louder ones, and does it on shut down.
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Old 08-15-2014, 01:57 PM   #12
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Most of the GM vehicles in the last 5-7 years that I've owned make that same noise in varying degrees
This has been my experience also.

Even heard Fords do it, their sound is slower.........and more irritating though!
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