I have a 1999 Olds Intrigue (3.8) with 137,000 miles.
When I start my car on chilly or cold mornings, I hear the sound of sloshing water coming from behind my dashboard. The sound becomes particularly noticeable when I start driving the car and make sharp turns. And I hear this sound regardless of whether it rained or not the night before. However, the sound goes away completely as the car starts to warm up (after about 10 to 15 minutes). This phenomenon has has occurred for the past three years I have owned the car. During warm days (i.e., later spring and the summer), I do not hear this sound when I start the car.
I had the A/C drain plug checked this past September, and it was not clogged. I have never found water inside the passenger compartment, either.
Anyway, if the A/C drain plug was clogged, why would the sound of sloshing water go away after 10-15 minutes?
Any ideas as to what I am hearing? Could it be coolant? (I don't smell coolant when I use the heater, and the heater itself works fine).