Can you diagnose my car....?

Take off the radiator cap, replace the car. Then get a new radiator cap. This car seems to have served you well. Time for the great junkyard in the sky. Add up the cost of repairs for this critter, and take a serious look at the bottom line. This is not a 66 mustang. Let it go! Let it be free to get recycled and make new cars! You can find a nice car for the cost of the repairs.