2009 Chevy HHR Blowing Air Noise When Accelerating

The noise you hear is usually normal on these models, because you will hear the turbo as well as the wastegate opening to releave the excess pressure in the turbo, that will give you a hairdryer sound, that is normal, you will also hear ticking noise from the engine when running because a direct injection fuel system that operates at very high fuel pressures. A direct injection fuel system produces a rapid, clicking/ticking sound that can be heard from the engine compartment. The sound is more evident when outside around the vehicle or when the hood is open. The sound is more noticeable during idle, and is more frequent during a cold start but lessens once the engine is warm. The rapid ticking noise on cold start up is the fuel pump (located on the rear of the cylinder head) building up high fuel pressure. When the engine warm-up is completed, the high pressure fuel pump will continue to tick at a lower rate of approximately one tick per second during idle. The clicking sound is the fuel injectors pulsing on and off under higher fuel pressures. These sounds are the results of a normal direct injection fuel system operating properly. This is normal for an SIDI engine, which is spark injection direct injection. As far a s the fans that is also normal because this vehicle has an innercooler for the turbo so the engine will run hotter which will cause more of a demand for the fans to come on. Post back with any other questions.