When you renewed your timing belt (due at 10 years old) did you renew the coolant (water) pump at the same time? If not I'd suspect the coolant pump.
If neither have been renewed yet do it now and give the cooling system a good back flush while you're at it. There could well be a heck of a 12 year build up of sludge in your radiator. If it is too bad then a new radiator could be on the cards too.
ChicksFan
July 2014
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