The bulb that lights the display went out 2 weeks ago, but heat worked fine. I tried to turn the A/C on today and that is blowing hot air. Switched the relay in the fusebox and heard the A/C clutch kick on, but still hot. But since I can not see the display, could not see if I really turned the air on, even though I pressed it twice. Any advice please?

 

Have the system checked for leaks. It's over 10 years old now and it would not be surprising that the refrigerant has leaked out.

 

It worked a few weeks ago. Can it leak that fast?