Why does the 17 Mondeo engine fan keep running?
2 Answers
The reasons why the Mondeo's electric fan keeps running are as follows: 1. Engine overheating caused by insufficient coolant, leading to continuous operation of the electric fan. 2. Engine overheating caused by radiator leakage, loose or damaged hoses causing water leakage, resulting in continuous operation of the electric fan. 3. Thermostat failure, due to which the temperature reaches the baseline but cannot send water to the radiator, or the water flow is insufficient, causing engine overheating and continuous operation of the electric fan. Thermostat failure, due to which the temperature reaches the baseline but cannot send water to the radiator, or the water flow is insufficient, causing engine overheating and continuous operation of the electric fan.
My previous 2017 Mondeo had the same issue - the cooling fan just wouldn't stop spinning like it was on steroids. Don't rush to replace the entire fan assembly yet, as it's likely caused by other components. Pop the hood and feel the coolant hoses - if there's a significant temperature difference between the upper and lower hoses, the thermostat is probably stuck closed, preventing proper coolant circulation and forcing the fan to overwork. Also check if the radiator's exterior is clogged with cottonwood fluff - blocked fins will make the fan work overtime. By the way, there's a wiring harness connected to the electric fan's rear - try spraying some electrical contact cleaner on it. I once had a loose connector causing erratic fan behavior - it's a common issue with this model. If the fan spins even crazier when AC is on, check the AC pressure sensor - signal drift can really mess up the cooling system.
