When I start my HHR there is a squeaking sound coming from the engine compartment. It sounds like something rotating. If I drive just a few blocks it goes away. Does anyone know what this might be?

Thanks,
Dennis
Houston

 

The serpentine belt and tensioner starting to fail, oil coming up to pressure? Loose harmonic balancer bolt?

 

AC compressor and alternator both have bearings that can fail. The air box bracket might be broken.