It is odd but the last couple days in the first 15 minutes of the drive or so, when I step on the gas to launch, I hear a water trickling type sound. The nights have been cold lately, down to -20C but this isn't cold enough to have the fuel freeze. Has anyone else heard this water trickling sound?

 

anyone? ^^

 

This happened to me as well. I think it was air in the coolant in my heater under the dash. I blead my coolant a couple of times and I have not heard the trickling sound come back.

 

Thanks TypeSH

 

I can confirm what TypeSH said. But this happened to the car I had before the S. There was air trapped in the heater core.