January 29, 2020 Service bulletin

Some customers may experience one side (driver side or passenger side) blowing warmer air out of the vents...

Mazda technical service bulletin 07-001-20-3660 for 2019-2020 Mazda MAZDA3.

Bulletin number: 07-001-20-3660
Component: Electrical system
Summary: Some customers may experience one side (driver side or passenger side) blowing warmer air out of the vents with the same or very close temperature settings for both sides when using the A/C and no DTCs related to the air conditioner system are stored in memory. This is caused by the air mix doors stopping operation during cranking and not recovering until the ignition is turned off. To correct this concern, the control software of the Dash-Electrical Supply Unit (Dash-ESU) has been modified.

Owners of these vehicles have filed 14 complaints in the electrical category.

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