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TSB Document:

Affected Component: ENGINE AND ENGINE COOLING

Summary
Some 2015-2018 F-150 vehicles equipped with a 3.3L, 3.5L Duratec, 3.5L EcoBoost and 5.0L engine without a block heater may exhibit a lack of heat concern from the heating ventilation and air conditioning (HVAC) system when operating the vehicle in temperatures consistently below -20 degrees C (4 degrees F). This condition may be due to deposits from the engine coolant becoming trapped in the heater core. Follow the Service Procedure steps to correct the condition.

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Date Published
AUG 21, 2018
NHTSA TSB #
10144911
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