If the fan is belt driven, it will run with engine running. Just for testing, remove the thermostat, hook everything back up. With radiator cap removed, can you see coolant? If so, start the engine, can you see coolant flow? The flow should instant, without the thermostat. If no flow, check the water pump.
Maybe the radiator needs to be flushed? Does it run any cooler without the thermostat?
Oil pressure is good?
Tuesday, June 28th, 2011 AT 6:02 PM