I recently bought a '91 Legend with the understanding that it had a blown head gasket. However, when I got it home, there was no sign of this problem - Ran great, no oil in coolant, no coolant in oil, doesn't use coolant, no smoke, compression is good in all cylinders, coolant system is not overpressurized. We've put 2k miles on it with no problems. Nothing until yesterday, when it started acting up on my wife. When I checked out the car last night, it was very low on anti-freeze. I filled it up, and let the car sit and idle. after a while it started to heat up, and I noticed that the lower radiator hose was still cold. Shortly after that, the cooling fans came on, and the air coming off the radiator was cold while the upper hose was very hot. I replaced the thermostat, but when tested, the old thermo seemed to be working. After installing the new thermo, I let the car warm up, and it was behaving the same way as with the other thermo. At that point I was running out of time. I needed a quick temporary fix, so I gutted the old thermo so that it would always be open, and installed it. I drove the car for about an hour and it seemed fine. Drove it to work today and it's still fine. I'm a little confused now. Shouldn't the thermo open before the fans kick on? There's no coolant leak that I can find. Can the head gasket use coolant intermittantly? Can anybody shed some light on this for me? Sorry for the long post, but any ideas?