It sounds like your problem is a broken BLEND AIR ACTUATOR inside the HVAC unit.
There is a litttle door inside the HVAC unit that routes air either though the heater core for heat, or the A/C evaporator for cooling. If the little motor that controls the door fails, you may not get any heat, or any A/C depending on the position the door is stuck in when it stopped working.
The fix is to replace the blend door actuator motor.
1. Open hood and disconnect the negative battery cable remote terminal from the remote battery post.
2. Remove the left and right underpanel silencer/ducts under the dash..
3. Remove the two screws from the actuator which are accessible from the right side of the center stack.
4. Remove one screw from actuator on the left side.
5. Pull the actuator straight down from shaft and disconnect the electrical connection. Upon removal, note the shaft position of the actuator, because the shaft on this motor is keyed. When installing a new actuator, its shaft must be positioned in the same location.
1. Connect the wire harness connector to the blend door actuator.
2. Install the blend door actuator on the HVAC housing, making sure its keyed shaft is positioned properly.
3. Install the three fastener screws and tighten to 2.2 Nm (20 in. lbs.) .
4. Install the left and right underpanel silencer/ducts.
5. Connect the negative battery cable remote terminal to the remote battery post.