Piston Slap: Saturn Squeaks for a New Serpentine Belt?

Josh writes:

I’ve asked you a few questions over the years, and the answers have always been excellent. Well now… I’ve yet another: about a month ago I picked up a rather humble ’99 Fleet Car White Saturn SL1. Despite an intermittent “Service Engine Soon” idiot light (which I suspected to be the typical rather crusty EGR valve, and was right), rear power windows I was warned by the owner “to not put them down,” it was clean overall, had traveled only 110k miles in its lifetime, and was a one-owner car. I paid the sum of $1,100 cash money and became the proud new owner.

It has four new tires (that match!), doesn’t piss any of its fluids or smoke, and has cold air conditioning. And three cheers for damned near 40 mpg. On to my question: when the engine idles, it sounds “squeaky.” Not squeally, like belt squeal… but squeaky. And it’s more than just a squeak when it idles, it’s present while driving. I can hear the squeak while I drive down the highway even!

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