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I have a 2004 GC with the 4.0 six. I've noticed that the GC doesn't seem to be cooling that well in city driving. I've had the cooling system flushed and new coolant added. Are there better radiators available? Ideas on better fans? Thanks in advance for your help.
 

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The stock cooling system should be up to the task of keeping things cool in stop/go traffic.

I'd say the fan clutch isn't working as it should or the radiator is plugged up a bit. When the engine is getting warm, can you hear the fan get noticeably louder? If not, the fan clutch isn't engaging. I'd start there.
 
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