Clicking noise when Auto or Econ or Defroster is on

[n00b on demand]

hey when ever i have Auto, Econ, or Def on there is a clicking noise that comes from near the glove box i think. the noise goes away after i click off. another thing i have noticed is that there is alot of heat that comes from under the car....more than other cars i have had before...ive never felt that much heat coming from the bottom of a car before....maybe thats just normal for the svx i dont know....another thing is that when i have it on Auto im guessing the a/c compressor goes on but the loud fan is on and its very audible from the front of the car....is it supposed to be like that?....i ask this because in my other cars when you have the air conditioner on you dont hear a loud fan like you do in the svx....you heare the fan in other cars just not as loud as the svx so i was wondering if any of you have the same thing or if its a problem with my car....the a/c isn't always cold either.....sometimes i will have my windows down and the setting to low and it will not blow out cold air but im guessing thats because the window is open or something....otherwise it works fine....haha this might all sound stupid but in my other cars i can have the a/c on and the windows open and it will blow out cold cold air...but this isnt the case in the svx...any input would be greatly appreciated