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Generally, in "chain" driven engines, it is not neccessary to change the timing chain unless it is seriously stretched or broken (only timing/cam "belts" require interval changing).
However, if you are experiencing the symptom of chain "rattle", then I would first reccommend you change to the correct grade of engine oil, then secondly, change the chain "tensioner".
the 2.2 is a timing chain. If the cover on the front of the engine is metal it is almost always a timing chain. If it is plastic is always a timing belt.
your car does not have a timing belt it has a chain. but yes if the pump is driven by timing belt and it starts leaking the coolant gets on belt and it will fail. if your car has the 2.4 engine the water pump runs off of the timing chain and depending on mileage it would be smart to go ahead and replace it since it will be tore down anyway will save on labor
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