The cricket noise was a common problem with the climate control on the '98s. It happened with mine whenever I had the fan set to "1". I turned it up to 2 of turned it off to get around it. I bet you have the A/C odor too...
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2003 GP GTP
Victory Red
Mods: Pulley Boys 3.4" pulley, JimmyC downpipe /w cat, MSD 8.5mm plug wires, Taylor plug boots(Red), NGK TR-55 IX plugs, Thasher CAI, MAP Throttle Body Spacer, MAP Exhaust heat shield, GMPP handling upgrade kit, Energy Suspension Poly bushings, 97-02 Lotek A-pillar(3 gauge), Autometer Sport-Comp guages (boost, oil pressure, transmission temp), SilverStars Halogen bulbs, Blazertech 2200 foglights, Hawk HPS pads, F-body brakes, and rebuilt tranny....