1997 Temperature control knob.

[bajadog]

Just recently my temperature control knob will only work to blow hot air, even
when on cold (blue side). If I run AC that works, and the heat (red side) works
as normal. I sometime just like to have a cold vent and not have the ac on or windows open.

Common problem?

Thanks.

 

[Joe Dirt]

Blend door actuator... Run a quick search, there is a write up on fixing it...

 

[Fixitorelse]

Blend door, actuator or both. Very common problem. Plenty of good write-ups.