Not necessarily, some thermostats are set to fail in the open position. The only way to check the thermostat is to take it our and see if it is open. If it is, it has failed. If not, slowly bring it up to boil in a pot of water and a thermometer to see when it starts to open. That temperature should be printed on the thermostat. If it does not pass this test, replace it, but at the price of thermostats you may just as well replace it anyway.
Not always the case. These aluminum head engines can even stay cool in moderate driving conditions. There is still some coolant flow, though restricted, just enough to keep it from severely overheating. I still wouldn't waste too much time even if the thermostat is in question. Just remeber, It's summer and termostats are much cheaper that getting a top end rebuild.
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