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Q: Hissing sound from the rear after parking the vehicle on 2004 Lexus GX470

I have a 2004 Lexus GX470. After the vehicle comes to a complete stop and I put the vehicle in park and get down, I can hear a "hissing" sound from the rear of the vehicle. I've noticed this doesn't happen all the time. Do you know what might be causing this? Sounds like air pressure release of some sort...not sure what it is. BTW, I've only had the vehicle for a month.
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Not to be rude, but, to the two grown adult males who said they heard a "hissing sound" coming from theirr $53,000+ SUV's and couldn't figure it out. Your an embarrassment and should have to drive a Geo Metro for punishment.
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