I have a 90 Prelude S (damn, I wish it were an Si) with the B20A3 engine (~172,000 miles). I highly suspect I have a blown head gasket based on the fact that my car:

1. overheats easily

2. sucks more antifreeze than a college frat boy slurps beer

3. doesn't leak antifreeze directly from the radiator or the reservoir or any hoses within the system (which pretty much reduces it down to leaking out the tailpipe)

I'm curious to see if anyone else has had a problem with this, and if so, if they would have any pointers on doing the job myself (with help, of course) rather than entrusting my "baby" to some underpaid grease monkey who probably still believes kicking the tires is a good indication of a car's worth. (Trust me, I live in the middle of Oklahoma...these people exist)

 

check your oil, if it appears milky then you definetly have a blown head gasket. also, see if you have any oil in your coolant. im about 99.9% sure its your headgasket. also, you can go to NAPA and buy this tool that you stick in the neck of your radiator and it will test for carbon monoxide i believe. It will turn one color if its present and remain another color if it isnt. this will tell you hands down if you have a blown head gasket. if you are mechanically inclined then i say replace the head gasket yourself, if you havnt done this type thing before have it done at a shop or someone around town that knows how to do this kind of thing. good luck!