L.W.
I had the same thing...EXACTLY the same thing. She had a cough 2 days before...but it was just a cough. The Anetheologist will make the call. our Anetheologist said that "she is normally a healthy person and its just a little cough, so I dont see any reason for delaying the surgury". the doc DID listen for a little longer to hear if there was rattling in the chest. Our daught did not have the rattling in the chest so they were ok to do the tubes. Honestly I was thinking to myself..."She ALWAYS has a cough and gets ear infections about once a month, how am I suppose to keep the kid from getting a cough/cold when they are in daycare and so little?" I think the docs understand that...I mean they know that the reason your boy is getting the tubes is because the canals are not draining. If the cough is not bad and its not a full blown cold (meaning waking up alot at night etc) then you should be fine.
Word of advice, tonight, give him a nice warm bath (steam up the room before drawing his bath) and give him a cool mist humidifer(with a new filter) tonight. Rub some baby vix on his feet and back. That should help with the cough...at least for the night. your LO will be a new baby tomorrow after surgury (well not RIGHT after, they are kind of cranky at first) but it in 24 hours, you will notice a big difference.
Good luck!! :):)