What you need to do is look inside his mouth to see if there is any fliud(congestion). He is not going to just open up and say AHHH, so you will have to hold him and GENTLY open his mouth. I just found out my snake had an RI yesterday and immediately took her to the vet. This same snake had one last spring. I have 17 snakes and this is the only one that ever got an RI. What I did to keep her warm was put her in a snake bag and then put the bag under my sweatshirt I was wearing and a jacket over. My body temp kept her nice and warm. Even the vet was suprised how warm she was. Luckily for me I got her there right away and the vet said it is much smaller infection than last time. We still did a culture because last time she had 2 different bacterias which required 2 different medications. You need to turn his temps higher 94 degress or so. The longer you wait the worse it may get. Watch her closely when the mouth is open if you see ANY fluid (even clear) or bubbling or even what may look like saliva stringing from top to bottom it's an RI. You also need to keep her ambient room temps in the 80's. I happened to take my snake out to show a freind yesterday and immediately noticed clear fluid stringing in her mouth and immediately made an appointment. Sometimes they can beat it on their own but that is not advisable. Snakes only have one lung and if that get too congested they will suffocate and die! I know some one who lost a 15 ft burmese to an RI. Also look to see if he picks his head straight up in the air and gasps or breaths, this is a sign he is struggling to breath through the congestion. Without a culture the vet won't know what bacteria he has and may treat him with meds that won't kill that specific infection. We started mine on a med that kills most infections but won't know if that is going to work until the culture comes back from the lab. They actually grow the bacteria in the lab and then test what antibiotic kills it. Good luck and keep us posted.