Heat blows cold on drivers side and hot on passenger side?

This problem is noticed on many car models.Some new car owners,think this is a heater core issue.But its not heater core problem.
If it was an issue with the heater core both side would not have heat.

In this case the  problem is with the blend air door inside the heater and a/c housing. What typically causes this is the door breaks and no longer is moving and you have to replace the door. This involves removing the dash and then the housing to access the door to replace it.

This will help.Thanks.

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