Had the battery changed, but now the (heat) vents in the top of the van and the floor vent (heat) does not work - only cold air comes out. Also, the heating/cooling dial lets it get hot midway on cold only. The a/c button will not shut off either.

Try this calibration procedure and let us know if you have more questions:

1. Start the vehicle.
   
2. Wait 40 seconds for the HVAC control module to self-calibrate.
3. Verify that no DTCs have set as current DTCs.
4. Clear all DTCs.
5. Place the ignition switch to the OFF position.
6. With the Mode knob in the PANEL position, press and hold the AC button for 5 seconds.
7. Rotate the Mode knob fully counterclockwise.
8. Rotate the Mode knob fully clockwise.
9. Rotate the Mode knob fully counterclockwise.
10. Release the AC button.
11. Wait 40 seconds for the HVAC control module to self-calibrate.
12. Start the vehicle.
13. Verify that no DTCs have set as current DTCs.