The 2003 Chevy Impala temperature sensor is situated inside the coolant pipe. You will come into many issues with a motor. A flash fitting might pop off,causing motor issues. A gasket might be free and that should be straightened out. A flash fitting might pop off,causing motor issues. A desperate issue is the motor overheating. This might prompt vehicle fires and the vehicle detonating. There could be extreme oil use,requiring the oil to be changed rapidly. Your air channel should be supplanted each 15，000 to 30，000 miles. The coolant should be supplanted each 60，000 miles. The flash fittings should be changed each 100，000 miles or so except if it's a copper one. A cooper flash fitting should be changed each 30，000 miles or something like that