Hi, I currently have a 2001 S 80 with cooling and/or engine problems and have an opportunity to buy a 2006 XC 70 AWD Turbo 2.5 with 148000 miles. Anything that I should know before going in on it?

Also, any thoughts on an S80 6 that keeps puttinhg the low coolant light on but when it cools down the light goes out? When it's hot the reservoir is actually low but if I take the cap off carefully I can see the reservoir filling back up.