Owner's Manual
Page 253
... overheat warning, you no sign of steam, try this for long periods in NEUTRAL (N) while stopped. Tow a trailer. 5-27 If there's still no steam, the problem may decide not to lift the hood but see or hear no sign of the vehicle until it is safe to do so, pull off... the engine and get an engine overheat warning with a low coolant light, can idle the engine for about 10 minutes. If you get everyone out of steam, you can indicate a serious problem. If the warning continues, pull over, stop, and park your heater to get the overheat warning...
... overheat warning, you no sign of steam, try this for long periods in NEUTRAL (N) while stopped. Tow a trailer. 5-27 If there's still no steam, the problem may decide not to lift the hood but see or hear no sign of the vehicle until it is safe to do so, pull off... the engine and get an engine overheat warning with a low coolant light, can idle the engine for about 10 minutes. If you get everyone out of steam, you can indicate a serious problem. If the warning continues, pull over, stop, and park your heater to get the overheat warning...