Heater blowing cold air on passenger side

2019 CHEVROLET MALIBU
46,000 MILES • 4 CYL • TURBO • 2WD • AUTOMATIC
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LISALAW1
  • MEMBER
  • 2 POSTS
Cold air is blowing when the heat is on. It's on the passenger side only.
Feb 15, 2021 at 12:48 AM
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KASEKENNY
  • ✓ASE Certified Mechanic
  • 18,907 POSTS
  • ASE Certified Mechanic
More then likely this is the blend door on that side. The blend door is responsible for routing the heat over the heater core and if it is not cold then this is the most common cause. Here is a guide that helps with this:

https://www.2carpros.com/articles/replace-blend-door-motor

Below you will the process from the manual on this. Let me know if you have questions. Thanks
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Feb 15, 2021 at 4:30 PM
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