01 Navigator - Engine Temp - Water Sound???
2001 NAV - enging temp always runs about 25% up on the guage (seems a little low) - heater works okay, but not as hot as it used to be. Now I am noticing a "swishy" water sound behind the dash (sound like water running through a pipe). Mainly notice this at first startup in the morning (when cold) or if it is at idle for a while. Any ideas what might be going on? Thanks for the advice?