my car just started overheating today. i was driving home, a few blocks from my house, when i noticed it was almost to red. by the time i pulled up to my house it was totally in red. it is a very hot day (about 85-90), but this has never happened before. the coolant was boiling over when i popped the hood and it took a few minutes for the temp to come back to normal. i hoped it was a bad mixture and added more antifreeze, then took it for a ride around the block. was back in the red by the time i finished. does this sounds like the thermostat? water pump? which is most likely and how much should these cost me to get replaced at a garage?
