What are you running as coolant?
Is there oil in your overflow cannister?
What is it about the engine that seems loud?
Can you see into the radiator? Is it covered with crap or is it clean?
When you top off the coolant is it always low and by how much?
Are you running stock hose clamps?
Is your fan shroud in good shape?
How's your fan clutch?
Are you smaller fans working?
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