Thermostat I have a 2005 Ford Thunderbird Anniversay. The problem is when I start my car and I am driving appx 3-4 minutes it starts to make a noise like an airplane engine starting and idling. I was told that the cost would be appx 582.08 this includes flushing. Now the issue is my car has never run hot and the mechanic said not to drive cause my car would overheat that has never happen. I was also told that it could potentially be another 200.00 something if the break the plastic part for the bolt. And I was told that this may not be the entire issue. This is a lot of money for not being sure, especially since we have the diagnostic capabilities that are superior than what was in the past. Please help me understand. Should I get another opinion?