Take off your oil fill cap and turn it upside down, if it is foamy inside then your coolant is seeping into your lubrication system. With the engine running take a good long sniff at your tailpipe, if you detect that sickly sweet antifreeze odor, then your coolant is going into your combustion system. Two most common causes of overheating with no evident leak. If either is evident, get to a mechanic ASAP
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