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I have been told by the Cadillac mechanics that this noise is the air pump, pumping additional air into the system upon start up during cool/cold weather. They stated that the breather pipe for this pump is near the lower frame and sometime water gets into the motor which causes the noise and...

Recently when starting my 2002 STS as soon as the engine is started there is a noise under the hood near the drivers seat of a motor turning. I've had it to the garage and was told this is an air pump and sometime its gets water in it and causes the noise. I was told all 2002's have this noise...