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Old 07-16-13, 11:18 AM   #1
rlim13
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Default 07 gs450h whistling sound from engine

hello, has anyone else heard a whistling sound from engine bay after driving and then parking? It goes on for bout a minute. Its not the usual whirling click sound. I took my car into service and mention it to the service writer. He said its the hybrid system. is that true? i cant seemed to find any comments about it anywhere.

any info will be greatly appreciated.
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Old 07-16-13, 01:36 PM   #2
neurocity
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You do know that when you turn off your 450h... you really aren't "turning it off".
Ive heard my car do things 3-4 hours after driving it.


In a nut shell, Yes I've heard that before. Totally normal.
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Old 07-18-13, 08:56 AM   #3
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This is the Hybrid System cooling pump. The power electronics and motor still need to be cooled after the car is off because they are a lot more sensitive to heat than the engine. It's basically the same reason why you have to idle a turbo'd engine after some abuse so that you don't cook the turbo bearings.
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Old 07-18-13, 08:30 PM   #4
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I was surprised by this noise when I first picked up my 450h, but I've been told that it's normal. I wouldn't worry too much about it. It's just the hybrid system cooling down, and I think it powers the electronics.
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Old 07-22-13, 09:10 AM   #5
rlim13
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thanks for the replies greatly appreciated. I've had this car for bout 4 years and never really notice that whistling sound. I did notice clicks and whirling sounds usually goin on and off for hours. thanks again.
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