Do the heater hoses get hot? Another issue could be actuator under the dash. The actuator moves one way, the air blows over the heater core and you get heat. The actuator moves the other way and the air blows over the evaporator and you get ac. This is just basic info for any vehicle.
Check out this guide I think it will help you get the problem fixed,
Hvac system diagnostics,
While pressing and holding auto button and fresh/recirculated air ( air intake control) button, turn ignition on. Indicators will flash on and off at one second intervals, 4 times in succession, and a tone will sound as an indicator check. After indicator check is complete, system will enter self-diagnostic mode. Stored trouble codes will appear in sequence on driver side temperature display. Press driver side temperature switch to display codes one at a time. If a tone sounds when code is displayed, problem causing code currently exist. If the tone doesn't sound when code is displayed, the problem is part history, doesn't currently exist. Press off button to exit self-diagnostics.
Just write down the codes and post back
Please let us know what you find.
Wednesday, October 23rd, 2013 AT 9:05 AM