Good morning. This may be a strange question...at least I think it is anyway. I'm hoping someone may know what this is and why. I began using the a/c about 2 months ago - sign of me getting older I guess ...I was never one to use the a/c. Starting about 2 weeks ago, there is this 'vinegar' like smell that comes out of the vents when the a/c is first turned on. After about 5 minutes, the odor disappears. A/C works great - very cool - everything is operating the way it should be. Strange how the 'vinegar' smell just started. Does anyone know what this is...or is it a sign of something that's about ready to go out...or is it just one of those 'unknown' situations? Thanks in advance everyone.