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Odd noise while car is shut off sitting in my garage

Jonnjohns

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#1
Hello good people, I have a question about a really weird noise coming from my engine occasionally, after the car is shut off in my garage. It sounds like a high pitch squealing noise, somewhere in the area of the Supercharger but I cant quite pinpoint it. It makes the noise sorta quietly, for about 3-5 seconds, and then stops for approx 2-3 minutes, as then repeats. It happens when nothing is turned on or running, and as stated before, It sounds like it's coming from the SC area when I lean into the engine area and listen real close. I know that it's hard to troubleshoot a noise without hearing it but I am open for ideas and maybe someone has had this happen or heard of this issue. It's almost like a high pitch electronic squeal but real low in volume, and sorta like pressure releasing?. Please help, this is driving me crazy and if I take it to the dealer, it probably won't do it there. Thanks in advance.

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LonestarHellcat

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#2
Is it more of an electric noise or from the pulley?
 
OP
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Jonnjohns

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Thread Starter #3
Is is definitely electronic, it happens when everything is off.

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HellcatMike

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#4
Dont worry, that's normal. It's the airvents opening and closing.
 

HarleyHetz

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#5
Which air vents, because it does it on my 392 as well...
 

Hellcatcfp

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#6
Are you talking about if you shut car off and say inside until cabin power shuts off? Mine sounds like a clunking sound as opposed to a squealing sound. Once you shut car off I open the door (to kill power) then shut door again...haven't heard that sound since I've done that procedure. Not sure what that sound is though?
 

HarleyHetz

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#7
Are you talking about if you shut car off and say inside until cabin power shuts off? Mine sounds like a clunking sound as opposed to a squealing sound. Once you shut car off I open the door (to kill power) then shut door again...haven't heard that sound since I've done that procedure. Not sure what that sound is though?
I'm not, and I don't believe the OP was either. This is a whining sound that occurs after you shut the car off and get out. You can hear it outside the car. I have heard it while washing the vehicle. It sounds almost like air escaping from a small orifice...let the jokes start now...
 

Hellcatcfp

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#8
I'm not, and I don't believe the OP was either. This is a whining sound that occurs after you shut the car off and get out. You can hear it outside the car. I have heard it while washing the vehicle. It sounds almost like air escaping from a small orifice...let the jokes start now...
Why yes. The one time I washed my HC with the engine hot...I started to hear a beep/chirping sound (very similar to some low battery beep/chirping from some devices). I thought it was something in my garage, but it was from HC engine. Haven't washed HC hot since then and haven't heard sound again
 

45-70govt

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#9
As weird as it may be, I can hear a very high pitched sound from the headlights before they turn off.
 

HarleyHetz

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#10
Why yes. The one time I washed my HC with the engine hot...I started to hear a beep/chirping sound (very similar to some low battery beep/chirping from some devices). I thought it was something in my garage, but it was from HC engine. Haven't washed HC hot since then and haven't heard sound again
Well, I wasn't washing the engine at the time, and it has happened several times, all with the hood closed...no biggie, it hasn't exploded yet...
 

HarleyHetz

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#11
As weird as it may be, I can hear a very high pitched sound from the headlights before they turn off.
Do you have LED headlights? It may be the fan on the back of the lights that you are hearing...otherwise, I've no clue!! :unsure:
 

Hellcatcfp

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#12
As weird as it may be, I can hear a very high pitched sound from the headlights before they turn off.
I leave early in the morning when the garage is dark...I love that sound when I open the door and everything comes to life. HC is getting ready for mayhem I guess? :devilish:

A day with that sound is a good day for me.
 

Confuzed1

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#13
Could be coolant escaping from your radiator cap back to the coolant reservoir, which would be normal. Then as the engine cools down, the coolant gets sucked back into the radiator.....at least that might be the "air escaping" noise. The electronic noise?....don't know that one.
 

45-70govt

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#14
Do you have LED headlights? It may be the fan on the back of the lights that you are hearing...otherwise, I've no clue!! :unsure:
Nope, just the stock lights.
 

2fast4u

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#15
Did you have AC running?...sounds like you described are similar for the first couple of minutes as system equalizes.
 

Hellcatcfp

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#16
Ok, not joking. Got home after work and decided to wash my tires and a touch up wash. Did not get water in vents. Hour and a half later I go to put our trash cans out. Left car in sun and is 93+ degrees today...hear the pissssst sound. Not sure what it is but I never hear it when I get home and pop my hood up with fan on engine...which I normally do to keep garage from getting super hot. My bet is a heat dissapation thing...maybe A/C or coolant related as discussed above. Sure would like to know...curious now.
 


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