The cooling system has a fail safe system this comes into operation in stages.The ECU will control the engine and if the temperature rises the engine will be restricted to below 3,000 rpm.This is what has probably happened , this occurs to stop you from major engine damage.I suggest you check that your electric fan is working to do this disconnect the connection and try jumping on your battery if this works your fan is ok.
octopus
December 2009
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