I started my 94 STS for the first time in a year and pulled it out of the garage after it idled for a few minutes it started to steam a bit around 130 degrees in another few minutes it was bilowing huge amounts of steam and by the time I got it back in the garage it wa up to about 190 degrees and I shut it off. On the way into the garage it dripped coolant in two lines 18 inches inboard of both sides of the car. Never any steam under the hood and really still ran pretty good. Is this a head gasket or is there something else that causes this? I hadn't had serious overheating problems before. It always ran at 205 on the highway and up to 225-230 in town sometimes, although I've only really used it on the highway. It has about 95,000 miles on it the coolant was changed a 2 years ago at the stealership when they recharged the A/C.