Air Conditioning problem

I have a problem with my air conditioning on my 1997 coupe. The passenger side gets nice and cold, but the drivers side feels only blows warm air. I
have the dual climate control system, but even with the driver's side temperature control set to the maximum cooling position, I only get warm air on the drivers side. Any ideas what could be wrong?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.