It is located on pass. side under the alternater.If so, this is what is going on.After starting a cold car, a clutch kicks in and this pump makes a lot of noise.After about 10 seconds the clutch kicks out and the noise goes away.
1.What is causing the noise?
2.Does the clutch only kick in once,because after driving i do not here the noise any more.
3.What is it's purpose?