To make a long story short:
-I own a 1999 Boxster with 75k miles.
-The plastic coolant tank on my car ruptured about 8 miles from my apartment. I filled it with 30% antifreeze and 70% water and got it home as quickly as possible, and the temp was climbing very fast. The hottest the gauge read was a little past the last white tick mark. I'm certain there was no coolant left in the tank when I got it home, and I'd be shocked if there was any circulation at all by the end. Getting up to speed and coasting in cool air did not reduce the gauge temp whatsoever.
-The car then proceeded to be sit at my apartment for a few months, and was towed without my knowledge. It was my fault for not going up to that level of the parking deck to check on it. Shame on me, I know.
-While in the tow yard, the temperature went down to around 5 degrees F. The temp stayed below freezing for 3 days, which is highly unusual for this area of the country.
Harsh judgments aside (I know, I'm a terrible owner,) I now have to decide whether the car is worth the tow and storage bill, which is $4300.
1) What are the chances my engine will be good to go with a new coolant tank? Should I be more concerned with the possibility of an overheat or a deep freeze?
2) If the engine is trashed, what sort of costs am I looking at to replace the engine?
3) If the engine is trashed, about how much is the car worth?
Thanks for your input.