It could be a waterpump, but if this just started after the radiator replacement, I would suspect they did not properly fill the engine with coolant. You could also have an air pocket in the cooling system.
The fan will run if the AC is on, but if AC is off and fan still runs, the fan switch is bad or a relay is stuck.
Again, if this happened after the repairs, I would take it back and have them fix it.
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Monday, June 30th, 2008 AT 7:47 AM