My temperature is stuck at 89! How do I fix it?

To fix your stuck temperature reading of 89, try hitting the 'temperature up' button several times. This should prompt the system to loop around to the lowest temperature setting, indicating that your car and the unit are resynced.

Here's some additional context: On some cars, particularly when the vehicle is turned off and back on again within a few hours, the HVAC system may not receive a new "set the temperature to _____" signal. Without this signal, the headunit displays 89 until it receives further instructions. By pressing the 'temperature up' button multiple times, you can prompt the system to reset and sync properly.

Give it a try, and let me know if it resolves the issue!