So I was fiddling with rerouting some of my stereo wire routing the other day and noticed the firewall padding undermy dash seems to be holding a bit of water. Before I go crazy and pull out my hole dash and go apeshit with the silicone caulking can someone tell me if there are any common sources of exterior-> interior leakage? I'm sure its not a leaky heater core since I don't detect any coolant odor and haven't noticed any foggy film on the inside of my windows (which previous experience tells me are the two big indicators of a leaky HC).

Door seals? Firewall grommets?

 

https://honda-tech.com/zerothread?id=724917 check that out

 

honda issued a TB on leaking windshields. they could leak from the base of the windshield and get the car wet. other spots include from the fenderwell, door jamb seals, firewall plugs, your A/C evap drain, rear hatch glass, and sunroof. other than that, decently keeps out water. going apeshit with goop will not help your situation. you need to have a buddy water hose your car while you are inside to identify the leak spot, then fix it at the entry point. if you goop it in the wrong spot, the water will fill inside somewhere or drain elsewhere...

 

from the thread that 96dxpower linked it looks like this was a TSB alert and not a recall and is no longer a free repair from the dealer.. Someone in that thread said they would post a scan of the TSB repair procedure document, but they never posted it. Anybody happen to have a copy?