Air stuck on defrost

[Red Rider]

Have you changed the controller yet? If you have not, i would suspect this is your issue.

There should not be any air flowing through the vents during calibration. If you do, you are doing it wrong and have it in the wrong position in the ignition switch (key). When it calibrates, it will cycle through (min to max door movement). you will here sound of motors. If you hear the moving, i would suspect they are fine and it is a controller issue. Turn key completely off. Then move it to first click.

You have to realize that the actuators are pretty damn simple technology. It is a just a little motor, gears, and a handful of electronics. People replace them thinking it is the problem, but i suspect that it is the controller that is really the problem.

 

[94SupraTT]

Mode door replacement
https://www.youtube.com/watch?v=Fceuk7QRnY4

Blend door replacement
https://www.youtube.com/watch?v=Eqf-H3COtSo


Mode door controls WHERE the air blows out of. Blend door controls hot/cold mix.


The mode door is about $75 and the blend door is about $45. Mode door is on drivers side. Blend door is on passengers side. The mode door's TOP BOLT IS A PITA to reach. You will need a 1/4 drive socket, about 6" of extensions and a swivel. The space is tight. The video suggests another way of getting it off but a swivel on a 1/4 drive should get it off faster. I know it did for me. Note there is a plate with gears on it behind the mode door actuator. DO NOT pull it off. Also, only put the bottom bolt back in when you replace it then test the actuator. If it works put the top on in. DO NOT OVERTIGHTEN THE TOP BOLT or the actuator will not work. I did this.