Blend door actuator is probably the problem.
2003 chevy impala driver side blend door actuator.
07 chevy impala the drivers side only blows cold air out no matter what setting you have it on the passenger side works like it should.
From full cold to full hot and back the center should move left to right to adjust the door you need to remove the trim panel under the dash first then remove the knee bolster under the steering.
First the electric motor can burn out rendering the unit non responsive so nothing changes when the temperature or.
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Hey guys so my parents 2003 tahoe wast stuck on blowing hot air on the drivers side.
Blend door actuator needs to be taken out and cleaned.
Drivers side blend door actuator not working.
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I have bad news for you if you run the actuator without it connected to the door the actuator is ruined it will have to be replaced.
I just used a paper towel and it has been working fine.
After replacement the system has to have the doors actuators re calibrated re calibrated.
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After some research i found out this blend door actuator was the cause.
The driver side actuator is located under the driver side of the dash to the right of the steering column you can check actuator by looking at the center of the actuator while adjusting the temp.
A blend door actuator is made up of an electric motor that turns a plastic gear set in one direction or another which is connected to an air control door pivot at the final drive of the unit.