Engine overheat warning with no steam

Symptoms

["In heavy traffic, let the engine idle in NEUTRAL (N) while stopped. If it is safe to do so, pull off the road, shift to PARK (P) or NEUTRAL (N) and let the engine idle.", "Turn on your heater to full hot at the highest fan speed and open the windows as necessary.", "If you no longer have the overheat warning, you can drive. Just to be safe, drive slower for about 10 minutes.", "If the warning does not come back on, you can drive normally.", "If the warning continues and you have not stopped, pull over, stop, and park your vehicle right away."]

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