Because there is a known issue with the brake lamps on the 2003 Trailblazer. I own a 2003 Trailblazer and had to take it in for service on a recall due to the issue. Take it to your Chevy dealer and have them check the VIN to see if the recall was ever done.
Blower circuit board is shot
A/C compressor not running
If done correctly, no.
possible grounded or bare wire
The difference between MDL fuses and ADL fuses are that MDL fuses are a slow blow fuse with a long time lag. ADL fuses on the other hand, are normal blow fuses with a medium time lag.
because there is a short somewhere
Your electric unit can blow fuses during the winter when you are running your heater for several reasons. The main reason would be that you have a faulty ground on your heater.
A short circuit either in your wiring system or electrical panel could cause your fuses to blow. Most likely, it would be caused by a burned out wire which is frayed and touching a piece of metal in your vehicle.
Check connection of ducts, check for blockage prevent air flow, check for vacuum problem prevent open/close of ducts
there should be a diagram on the back of the plastic panel you had to remove to look at the fuses.
I would start with about 3 quarts and run the engine and drive a LITTLE and check the level..and slowly add more fluid to the transmission. Overfilling can cause excess pressure and blow seals.
A short to ground causes all fuses to blow. If you have a trailer connecter then start there first.