Electric fans are turned on by the engine computer at 212 degrees, and off at 198 degrees.
Check the radiator fins to see if they're crumbling away. Too much antifreeze concentration will reduce the coolant's ability to transfer heat. Water can hold and transfer more BTUs of heat than antifreeze. Straight water is better at cooling the engine than any antifreeze, but antifreeze is necessary for freeze protection and for the additives which include water pump lubricant and anti-corrosion chemicals.
Make sure no one removed the shroud around the fan. That will allow air to bypass the radiator.
Thursday, April 23rd, 2009 AT 3:23 PM