It sounds like the flapper valve behind the dashboard that diverts the incoming air from outside air to AC cooled air is not working. The cable wire may have come loose. It's located under the right side of the dash. If it's like my 1989 - you can access it by removing the glove box... fairly easy to do, just open the glove box and remove the upper and lower phillips head screws, and gently pull the glove box out and unplug the wiring connector on the left side. Also check to see if the solenoid valve is working when you change from off to heat or cool.
HEATER NOT
BLOWING COLD,NO HOT AIR FROM HEATER,A/C BLOWS HOT AIR,A/C NOT BLOWING COLD,
COLD AIR FROM HEATER,BLEND DOOR ACUTATOR CLOSED,HVAC UNIT NOT OPERATING,
http://alltypesofpartsreplacing.blogspot.com/2012/12/heater-not-blowing-coldno-hot-air-from.html
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