Alright, first actual post, but I've lurked this thing for a while. I have a 2004 Grand Prix and I'm having a mysterious coolant leak somewhere. I can't figure out where though. I've checked through the topics on the forum with no help.
-It's not the head gasket, I tested it (also no weird smoke or anything like that)
-I changed the radiator hose's and that didn't fix it
-there are no puddles or wet areas that I can feel or see (including in the car)
-The way I know it's leaking or low, without constantly checking, is the "sloshing" sound that comes from behind the dash (sound like a fish tank sometimes) from when I start it in the morning, but it eventually goes away. I've been putting water in it for now since, coolant costs way more and it's gone through a few jugs in the past month or two.
Anyways, again, every area that the leak could be from (according to threads on there) seems to not be it. If you guys could offer any help that'd be amazing. If not I'll just have to take it to a dealer mechanic and pay $100 or so to get it diagnosed. Thanks in advance.