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does the temp gauge register the overheating ? sometimes the sensors go out and they do not trip the CEL. also another thing could be a blown head gasket or a big ass air buble in the water pump. have the compression checked, or a leakdown test done. if that does fine just drain and fill the coolant system again. also check to see if your timing is not out of whack since you did all that mad work on the timing belt.
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