High pitched whining sounds from engine bay

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Outdoors76

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Have any of you ever heard these it's high pitched sounds coming from engine bay with engine off?

This happened when I first got my truck and now it's happening again after two years. It may sound odd but I think it does this after being run after it has say idle for a while if that makes sense because it did this for a few weeks when I first bought it and it obviously had say on the lot for a year as it was a leftover. Then recently in been working from home and truck sit in driveway for weeks at a time almost a month. Then I drove it yesterday and decided to wash it. While washing I kept hearing the sounds again I cannot figure out where it is coming from.
 

Dave2018

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The electric fans?
 
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Outdoors76

Outdoors76

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The electric fans?


I open the hood nothing physically moving or running. It fades away then starts again. Almost sounds like pressure relief or something. . It is odd and does not do it when I drove the truck every day.
 

jws123

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Try to get a recording/vid of it next time it happens or not much anyone can help with.. could be anything
 

22hemi13

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Ac equalizing? Have your tried running without ac and see if it does it?
 
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Outdoors76

Outdoors76

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Ac equalizing? Have your tried running without ac and see if it does it?
Well we had 6 inches of snow last Saturday no need for ac here.

I'll try to post a sound clip when I hear it again.
 
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Outdoors76

Outdoors76

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It's like a whining/hissing sound. Happened first day I brought home truck too. My wife came home an hour after me in January saying my truck sounds weird and maybe it was going to blow up lmao. Dealer could not find anything and after driving it daily it went away. Now that it sits and I only drive less than once a week it's baaaaaack lol
 

Kicker96fs

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Do you know where your cat is?
Mine used to (I said used to) sleep under there until the fan blade chopped a hole in her side one morning.
 
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Outdoors76

Outdoors76

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Do you know where your cat is?
Mine used to (I said used to) sleep under there until the fan blade chopped a hole in her side one morning.

Unfortunately my cat is too fat to move and she takes my chair all the time she barely goes outside now. Lmao
 
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Dave2018

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You know, it could be the cat, cats do hisssssssssssssssssssssssssssssssssssss at times. LOL

Im sorry but It's the CAT'S chair, bed, house, she just allows you all to use it occassionally...
 
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Outdoors76

Outdoors76

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You know, it could be the cat, cats do hisssssssssssssssssssssssssssssssssssss at times. LOL

Im sorry but It's the CAT'S chair, bed, house, she just allows you all to use it occassionally...

She's too fat
 

Lyle Longboat

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Depending on year, It could be the new super chargers that come stock on these newer Rams. They are known to Make these high pitched whistlen sounds when the engine is turned off due to excess pressure internally. It’s just a matter of time before she blows!
Hope you not parking near the homestead!
lol
 
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Outdoors76

Outdoors76

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Depending on year, It could be the new super chargers that come stock on these newer Rams. They are known to Make these high pitched whistlen sounds when the engine is turned off due to excess pressure internally. It’s just a matter of time before she blows!
Hope you not parking near the homestead!
lol


Oh
 

dpost01

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The only experience I have had with this is coolant in the system hissing and making noise after the vehicle is ran and then cooling off.
 
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Outdoors76

Outdoors76

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The only experience I have had with this is coolant in the system hissing and making noise after the vehicle is ran and then cooling off.


This was more electronic sounding. And happened hours after it was shut off.
 

18CrewDually

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Mine makes noises after 4-5 minutes of shutdown. It is the Body Control Module running a test on each motor for the vents in the HVAC system. It lasts about 10 seconds or so. I've never caught it doing it randomly but my truck doesn't sit for more than 8 or 12 hrs usually.
 

misfit77

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I have a whine that is rpm specific.

Im too lazy to look but im guessing it's rhe fan clutch. There are time it runs way too long after starting.
 
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