islandguyja

Hi guys,,, i have a 04 s2k and have always noticed that when the air condition is on i sometimes get a "sirien" noise commming from the back of the car. I notice this only occurs with the a/c on and it is always during when i am braking to a stop ........just courious if anybody else has expericanced this and had look behind them for the flashing red and blue lights like i have couple times!!!!

Wisconsin S2k

I'm not sure what a "sirien" noise is? do you mean SIREN?

If that's what you mean I know what you're talking about. It has nothing to do with your AC. When you are coming to a stop, I'm willing to bet money you put the car into 1st gear before you've completely stopped, right?

When you do that, the noise you are hearing is the synchros working their magic. It's a normal noise and nothing to worry about.

Go out and try it, and i gaurantee, as soon as you put the car into 1st gear as you are slowing down, you will hear the noise.

xviper

"Siren" noise from back ............... could you also describe it as "whining", "humming", or "whirring"? When it happens, how much fuel does you fuel gauge say you have?
Could be what Wisconsin said but that noise would come from beside you (tranny).
Could also be fuel pump when the fuel tank is low as coming to a stop will slosh fuel to the front and there would be less fuel to insulate the sound of the pump.
Could be wheel bearing.
Could be diff noise.
Could be brake noise. Does it stop if you take your foot off the brake?
Do you have an amp for the stereo? It may not be shielded well and you are getting charging system feedback.
With the exception of the fuel pump, all those other noises will change pitch as you go slower. Does it?