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Several years ago, I bought a '97 Ford Thunderbird from my sister. She needed a larger vehicle since her family was about to expand. It only had 65,000 miles on it. About a few months into owning it, I notice the heat was no longer working, so I took it to a local Ford dealer and waited 5 hours for them to diagnose the problem using their Diagnostic equipement. The machine indicated that the atmospherically controlled heating components needed to be replaced. It would cost me about $900, but I needed heat, so I had them replace the components. When I paid for the repairs and picked up the car, I looked at the Itemized bill and notice a short hand written note by the mechanic: "Head gasket leaking". After speaking to the mechanic he recommended that it be replaced soon. I was shocked as I had several GM cars in the past with 200,000 miles + and never had a head gasket problem, especially around 67,000 miles. Well, after driving it for about 30 minutes, still had no heat...