Lack of heat concern from the heating ventilation and air conditioning (HVAC) system when operating the...

Bulletin number

TSB 20-2034

Component

Seats: front assembly: seat heater/cooler

Summary

Some 2015-2019 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 1-Jan-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 -20Å’C (4Å’F). This condition may be due to deposits from the engine coolant becoming trapped in the heater core. To correct the condition, flush the cooling system and replace the heater core.

Owners of these vehicles have filed 85 complaints in the seats category.