Open up the radiator cap and have helper start the car while you look inside the opening -do you see the coolant squirling around if so have the helper increase engine speed did the coolant flow increase if so the water pump is okay-On the radiator while engine is idling feel the radiator for cold spots could also be airlock try bleeding it, if it continues get it block and pressure tested.
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Tuesday, June 15th, 2010 AT 4:58 PM