My daughters S40 has the split climate controls. The passenger side is only blowing cold air. I figure the control that mixes the hot air in is broken on that side but looking for advice on how to get to it if anyone has had a similar problem. Heading out to the garage now to crawl up under the dash. Driver side works fine. Thanks, Brian

 

I haven't had to fix one but I would remove the glovebox and look in from there.