Owners of 2008 Ford F-Super Duty pickups, as well as Ford Escape and Mercury Mariner SUVs, may come into your store with a complaint that their blower motor doesn't work or shifts between high and low speed on its own.
The motor operation often returns to normal after cycling the ignition key.
Ford says the problem only affects trucks with automatic temperature control systems and is due to a defective blower motor controller. Installing an improved design controller, part No. 7C3Z-19E624-C, should eliminate the condition immediately.
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at tireb[email protected].