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Originally Posted by PriusGuy04
I to have heard this sound on my 04' with the engine off and locked up ie physicly parked .. Not sure what it is I hear it coming fromt the left front, it has done that since the day i picked it up. I would guestamate its normal.
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That sounds like the coolant storage system putting the hot coolant into the thermos for up to 3 days of instantly hot coolant ready to inject back into the engine upon startup.