Coolant Temperature Warning / Engine Overheating

How to Fix It

1. Pull over and turn off the engine.

   Stop driving as soon as it is safe and turn off the engine immediately. On EcoBoost-equipped Fords (F-150, Explorer, Escape), continued driving during overheating can cause turbocharger damage in addition to head gasket failure. Turn on hazard lights, coast to a stop, and switch off.

2. Wait before opening the hood.

   Allow the engine to cool for at least 30 minutes before approaching the cooling system. Ford cooling systems operate under pressure — the degas bottle (expansion tank) and radiator hoses are under pressure when hot. Cover the degas bottle cap with a thick cloth and release slowly if you must open it sooner.

3. Check the degas bottle (coolant reservoir).

   Ford vehicles use a pressurized degas bottle rather than a traditional overflow tank — it has MIN and MAX marks. Check the coolant level and also inspect the bottle for cracks, which are a common cause of gradual coolant loss on high-mileage Escapes and Explorers. A cracked degas bottle drips coolant slowly and may not be obvious until the level becomes critically low.

4. Check the EcoBoost coolant pump.

   Ford 1.6 and 2.0 EcoBoost engines use a coolant pump with a plastic impeller that can break free from the shaft, causing sudden coolant circulation loss. If the engine overheats very suddenly from normal temperature rather than gradually, a broken impeller is likely. The pump is relatively accessible and a known failure item — a Ford specialist can diagnose and replace it.

5. Check the thermostat and radiator fan.

   A thermostat stuck closed prevents coolant from circulating to the radiator — the engine overheats quickly from startup. With the engine at operating temperature, the radiator fan should be running — check the fan relay and fuse if it is not. Both the thermostat and fan relay are inexpensive parts and logical first repairs after coolant level is confirmed normal.