Lack of heat coming from the driver side vents when operating the vehicle in ambient temperatures below...

Bulletin number

TSB 18-2253

Component

Engine and engine cooling

Summary

Some 2017-2018 F-Super Duty vehicles equipped with a 6.7L engine built on or before 8-Jul-2018 may exhibit a lack of heat coming from the driver side vents when operating the vehicle in ambient temperatures below -20Å?C (4Å?F). This condition may be due to deposits from the engine coolant trapped in the heater core. Follow the Service Procedure steps to correct the condition.

Owners of these vehicles have filed 90 complaints in the engine category.