Driver's side does not get hot air only cold?

Yep, 9 times out of 10 it will be the blend door actuator for the driver side, here is the location and how to change it out which should fix the problem. You might want to try and reset the system though.

This guide can help:

https://www.2carpros.com/articles/step-by-step-guide-to-reset-your-cars-hvac-system-an-essential-for-every

Check out the images (below). Let us know how it goes.