2006 Avalanche Overheating ISSUE!
2006 Avalanche, 5.3. Replaced Water pump, Thermostat, Engine Coolant Temp. Sensor, properly filled with correct fluid, NO WATER in oil. (Typically rules out head gasket). Hoses appear to be fine, both are warm to hot, not collapsed. There appears to be flow, when heated. Runs fine at idle for up to 25 or 30 minutes, after driving a few miles, Temp will jump from 165-170, to redline in mere seconds!!!

