Visually you can't really check the coolant level in the raditor, Make sure there is plently of coolant in the raditor. Also check all your coolant hoses see if there any slight leakage of coolant. If everything goes well, check the raditor...The raditor might be going bad or your water pump is not functioning properly. See if your fan is runing good if its not i suggest to up grade to a electrical one.
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'90 240SX w/SR20DET
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