Re: liquid(gurgling) noise behind dash
I had a liquid sloshing trickling sound behind my dash as well. It happened whenever the engine was brought above idle, then would disappear once the truck was rolling above 15MPH or so.
I had thought that there was water trapped in a frame rail or something, except that the sound occured whether the vehicle was moving or not.
Turned out it was something to do with the heater hose running along the top of the firewall in the engine compartment. Probably had air in it. I ran my HVAC through all temps/settings and it went away.
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