I strongly recommend that you get a second opinion. I'm sure the car is worth more than the repair, but I think you would have noticed some of these problems. Plus, the coolant in the engine is most likely an intake gasket, not a cracked head. The heads are a proven item that normally holds up more than 101K. However, they are known for intake gasket problems.
Let me know if you have any questions.
Saturday, December 6th, 2008 AT 12:02 AM