"Bubbling" fluids sound!
 

Hi everyone...
Let me start by saying my WRX runs perfectly. I have 24k miles, and keep it in tip-top shape. Over the last month-6 weeks, I have noticed the following noise coming from the engine compartment: After starting the car & pulling out of the garage, I hear a faint sound that is similiar hot water running through pipes of a home radiator heating system. Kind of like a bubbling, percolating sound. It is very faint, and doesn't last long. I can sometimes hear it also when the car is warmed up and I stop at a light, etc. It lasts only a few seconds, and except for that sound, I notice nothing else (no odors, all fluid levels are perfect, no drop in performance, etc.). I know this is something if I have the dealer check out he won't find anything! (I will have him look at it when I bring it in for maintanence so there is a record for the future). Has anyone experienced this or know what I might be trying to explain?! Thanks for any advice.

this is caused by the coolant rushing into the heater core.you may have air in the system causing the noise.just bleed the system.