04 5vz-FE rushing water Sound

At random times it will sound like water is rushing through my dash.

I have no CEL on, no misfires, the truck seems to be running fine.

So far since mile one my only CEL's are o2 sensors.

I've read about it maybe being the head gasket?
Can I get some imput
Would love to stop a problem before it stops my truck.

 

Mine does the same. Mines the a/c though. I suspect that's what you're hearing

 

Typically this happens when your HVAC drain gets clogged, so water from your AC can't drain out. If you run your AC a lot eventually it drains out at a higher level, often onto your feet. I don't know where the drain id on Tacoma's but if you know where the puddle used to form when your are parked and running the AC in the heat, look directly up from there. Its usually a short rummer hose. Blasting a little compressed air in there is usually enough to get it draining.

found this thread http://www.tacomaworld.com/forum/2nd-gen-tacomas/46737-c-evaporator-drain.html

might be a good time to reroute it.