I have a 99 and am assuming the 97 is the same way. First place I would look is at the fitting the heater hose plugs into. It's on the front of the intake manifold on the passenger side right behind the alternator. I had a leak coming from this a while back. Fairly cheap part, only cost like $13 bucks but Ive heard the threads break off on the fitting pretty easily causing you to have to use an easy out to get the broken part out. I went ahead and got mine done at the dealer. Cost like $80. If that looks good, might want to start looking for the dreaded, notorious intake manifold gasket leak.