i just recently bought a 2004 350z base, with a clear autocheck report. drives fine and everything, i usually drive with the music blasting, it was one of the very few times when i had the radio off i heard a faint squeeling. not having the car for a full week( bought it about 2 hours from where i live with no dealer warranty, however i did purchase the nissan 36k/3 year bumper to bumper warranty that i haven't gotten a copy of yet, the application paperwork says i should get it within 30 days in the mail) so i go to pepboys( it was a sunday) and they suggested some belt conditioner. so i buy it and spray it on the belt, only a small portion of it. so i start the car and after 20 seconds the squeel was completely gone......for about 40 seconds then came a ( louder than the squeeling) pulsating hiss...that was yesterday....any ideas and or suggestions would be very much appreciated before i take it to the dealership to look at( btw i called the dealership and they told me belts are not covered in the bumper to bumper warranty)

 

"Belt conditioner" is bad stuff. Do not use it. You know that now. The guy you talked to gave you bad advice. It somehow has a property that completely ruins belts... maybe the manufacturers of belt conditioner are in cahoots with the belt manufacturers. Likely the only thing to do now is remove the belt, clean all the pulleys, and install a new belt. Good luck.