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Heating / Cooling

Ford F-150: Lack Of Heat In Low Temperatures

Some 2015-2019 Ford F-150 vehicles equipped with a 3.3L, 3.5L Duratec, 3.5L EcoBoost and 5.0L engine and equipped with a block heater built on or before January 1, 2019, may exhibit a lack of heat concern from the heating ventilation and air conditioning (HVAC) system when operating the vehicle consistently in temperatures that are below – 20°C (- 4°F). This condition may be due to deposits from the engine coolant becoming trapped in the heater core. 

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To correct the condition on some models, flushing the cooling system and replace the heater core is required. See TSB 20-2034 for the full diagnostic procedures and flushing method.

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