Owners of 2007-10 Mazda CX-9 SUVs may complain that the front and/or rear blower motor continues to run after the ignition key is switched off.

According to Mazda, the problem usually comes and goes and is due to the blower motor relay contacts intermittently sticking.

Replacing both the front and rear blower motor relays with a new and improved relay, part No. G115-67-730, should eliminate the trouble immediately.

For your information, you'll find both relays in the main fuse block.

"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 tirebusiness@crain.com.