i hope you have someone who is mechanically minded looking at these with you. An overheating car on a test drive could potentially be a very good reason to drive down the price if the rest of the car is good if a person knows what to check. Basically it could simply be a thermostat or rad. rusty rain gutters...well, looks like sooner or later most will get afflicted with this condition judging from the many posts, so again another (depending on the rest of the car) reason for you to knock off a few hundred to get that done.