Hey all, as I was fixing a coolant leak today I noticed what sounds like a vacuum leak coming from around the power steering reservoir. I'm going to go at it with a can of WD-40 tomorrow to see if I can pinpoint it...but was wondering if there's known problem here that someone could point me to.

Don't use WD-40 to find a leak... it deteriorates plastic (and presumably rubber). It probably isn't O2 sensor safe either and can't be good for the catalytic converter. If you're going to find a leak with a spray can, use starting fluid or intake cleaner (must say "danger: extremely flammable", just "danger: flammable" isn't flammable enough to affect the idle much. If that's the 2.4 or 2.2 Ecotec, it's probably in the brake booster hose or the evap purge hose. If it's the 2.2 OHV or a V6, I don't believe there are any vacuum lines/hoses near the pump.