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These cars will get hot.
You want to get rid of that sound, get a downpipe and plug all the holes around your radiator so that all available air is forced through the radiator.
You will be surprised how effective that can be in cooling the engine.
I believe it's because u have air in your cooling system...there should be no gurgling/boiling sounds. I'm pretty sure that is what it is...because i had that same exact sound but when i changed to my Koyo radiator and bled the system i haven't heard the sound since.
Not to scare you unnecessarily, but when my water seals failed, I started getting LOUD boiling sounds. Plenty loud enough to hear with the hood down. People would actually come get me to make sure everything was ok with my car.......
It's usually pretty normal depending on how hard you were running the car before shut down.
Basically, it's just localized boiling as the coolant is no longer circulating through the car (and you have no air coming into the engine bay). So, if the car is extremely hot, it can do a little boiling and bubbling sometimes (which is why it's nice to still keep the AST around).
However, if you are getting that sound and not running the car very hard you might pressure test your cooling system.
Also, make sure to drive without boost for a while before getting home and shutting the car down. Keeping the car moving and off boost is the best way to cool it down.
Originally posted by WONG FRIED RICE I believe it's because u have air in your cooling system...there should be no gurgling/boiling sounds. I'm pretty sure that is what it is...because i had that same exact sound but when i changed to my Koyo radiator and bled the system i haven't heard the sound since.
I don't think it has anything to do with air in the cooling system. The stock radiator can't keep the car cool enough after long runs. Your Koyo can, so the boiling sounds disappear. Nothing to do with air, everything to do with cooling