Why is the climate control panel blinking and blowing air low to high

What items need to be removed at the dash panel to gain access to the heater core

Started with passenger headlight went out went and bought replacement still did not work tried new bulb on driver side worked bout car back together woke up next day driver side did not work and passenger side worked checked fuses all good ordered ballast and replaced those need help

they are telling me that it may need replacing, I thought it was plastic

The theft deterrent lock was activated on this vehicle how do I remove it? Please help!!

My 2008 Cadillac escalade has a theft deterrent lock on it. How can I remove it?! Please help!!!!!

Is there special oil