Not enough data. Open the hood and then start the engine and determine where the sound is coming from. It should be from the passenger side of the engine. Do NOT run the engine for very long, if it is a belt it can melt and cause more damage!
You can use a wooden stick or very long screwdriver. Just hold one end on the suspect engine part and the other end touching the bone just infront of your ear. Be careful that a turning belt does not touch the stick!!
If the noise comes from the driver's side, it could be the SAS pump.
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