Owners of some 2001 Mazda Millenia models may comment that there's very little or no heat coming out the HVAC vents, even when the climate control head is set to max heat.
According to Mazda, incorrect logic in the a/c amplifier is a very likely cause for the problem. Installing a revised amplifier with improved logic, part No. TC86 61 790C, should eliminate the complaint. For reference, you'll find the amplifier in the dash, directly behind the climate control panel.
"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 [email protected].