I just bought a 2004 Trailblazer that seems to have all the standard problems these have (gauge needles not working, fan clutch). But my wife's biggest complaint right now is that the radio is not very loud. I thought it was just her, but it really is not very loud.

Ok, for the details, it is the LT model with the Bose am/fm/cd/cassette/xm radio. There is sound coming out of all four of the speakers. only real thought on it was a dead amp, but not knowing much about stereos, also thought if the amp was dead, I would not be getting any sound from it. The amp fuse is good and it does not mater the input source, the sound level is the same. Can the amp be tested or am I looking in the wrong direction?

Any ideas would be great.
Thanks guys (and gals)!!